{"product_id":"nos-gm-delco-moraine-5461975-903-y-k-33271","title":"NOS GM \/ Delco Moraine 5461975 – 903‑Y (K‑33271)","description":"\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eGM \/ Delco Moraine 5461975 – 903‑Y (K‑33271)\u003c\/strong\u003e is a \u003cstrong\u003emid‑1950s front wheel‑cylinder rebuild kit\u003c\/strong\u003e from the \u003cstrong\u003e903‑series\u003c\/strong\u003e, the same family as 903‑X and 903‑T. The \u003cstrong\u003e903‑Y\u003c\/strong\u003e suffix is one of the less common variants and typically indicates a \u003cstrong\u003erubber‑compound update\u003c\/strong\u003e or \u003cstrong\u003espring‑style revision\u003c\/strong\u003e used in later service‑stock production. This makes 903‑Y a desirable NOS piece for Tri‑Five restorers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003e903‑Y part identity\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eGM Part:\u003c\/strong\u003e 5461975 \u003cstrong\u003eDelco Moraine Kit:\u003c\/strong\u003e \u003cstrong\u003e903‑Y\u003c\/strong\u003e \u003cstrong\u003eAlternate Kit Number:\u003c\/strong\u003e \u003cstrong\u003eK‑33271\u003c\/strong\u003e \u003cstrong\u003eType:\u003c\/strong\u003e Wheel Cylinder Repair Kit \u003cstrong\u003eBore Size:\u003c\/strong\u003e \u003cstrong\u003e1\"\u003c\/strong\u003e \u003cstrong\u003eEra:\u003c\/strong\u003e 1955–1958 GM full‑size \u003cstrong\u003eTypical contents:\u003c\/strong\u003e Rubber cups, boots, spring, retainers, piston seals\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 903‑series was Delco’s service line for \u003cstrong\u003eTri‑Five and early post‑Tri‑Five\u003c\/strong\u003e brake systems before the 901‑ and 904‑series redesigns.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eGM \/ Delco Moraine 5461975 (903‑Y \/ K‑33271) Brake Cylinder Repair Kit – NOS\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGenuine New Old Stock Delco Moraine \u003cstrong\u003e903‑Y\u003c\/strong\u003e wheel‑cylinder rebuild kit for mid‑1950s GM full‑size models. Correct for \u003cstrong\u003e1955–58 Chevrolet\u003c\/strong\u003e (150, 210, Bel Air, Biscayne, Impala) and \u003cstrong\u003e1955–58 Pontiac\u003c\/strong\u003e (Chieftain, Star Chief, Bonneville) front wheel cylinders using the 1\" bore design. This 903‑Y variant is a later GM service‑replacement kit within the 903‑series family.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eDetails:\u003c\/strong\u003e • GM Part: 5461975 • Delco Kit: 903‑Y • Alternate Kit: K‑33271 • Application: Front wheel cylinders (1\") • Models: Chevrolet \u0026amp; Pontiac full‑size, 1955–58 • Condition: NOS, stored in climate‑controlled inventory\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA scarce early‑Delco brake component—excellent for Tri‑Five restorations and collectors seeking correct‑era packaging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eFitment chart\u003c\/h3\u003e\n\u003ch4\u003eChevrolet – Full‑Size (Front Wheel Cylinders)\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1955 150 \/ 210 \/ Bel Air\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1956 150 \/ 210 \/ Bel Air\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1957 150 \/ 210 \/ Bel Air\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1958 Biscayne \/ Bel Air \/ Impala\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003ePontiac – Full‑Size (Front Wheel Cylinders)\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1955 Chieftain \/ Star Chief\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1956 Chieftain \/ Star Chief\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1957 Chieftain \/ Star Chief\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1958 Chieftain \/ Star Chief \/ Bonneville\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThese platforms all used the \u003cstrong\u003e1-inch Delco front wheel cylinders\u003c\/strong\u003e, making 903‑Y a direct‑fit service \u003c\/span\u003e\u003c\/p\u003e","brand":"CorvairFarmer","offers":[{"title":"Default Title","offer_id":48676026777851,"sku":null,"price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0659\/3740\/8251\/files\/aa1_59c62d64-5294-49b2-9739-e0361a752224.jpg?v=1775944532","url":"https:\/\/corvairfarmer.com\/products\/nos-gm-delco-moraine-5461975-903-y-k-33271","provider":"CorvairFarmer","version":"1.0","type":"link"}