{"product_id":"thermostat-housing-gasket-gmt400","title":"Thermostat Housing Gasket - GMT400","description":"\u003cp\u003eThermostat housing O-ring for the 1988 to 1998 Chevrolet and GMC C\/K (GMT400) with the 5.0 or 5.7 V8.\u003c\/p\u003e\u003ch3\u003ePart numbers\u003c\/h3\u003e\u003cp\u003eGM 12551507 (replaces 12553106). Genuine GM part.\u003c\/p\u003e\u003ch3\u003eFits\u003c\/h3\u003e\u003cp\u003e1988 to 1998, 5.0\/5.7 V8, both TBI and Vortec, this one part covers the whole range.\u003c\/p\u003e\u003ch3\u003eWhy it matters\u003c\/h3\u003e\u003cp\u003eThis gasket hardens with heat cycling and is a common source of coolant seepage at the housing, often before the housing itself shows any real wear. Cheap to replace and worth doing any time the housing or thermostat comes off.\u003c\/p\u003e\u003ch3\u003eWhat you get\u003c\/h3\u003e\u003cp\u003eOne thermostat housing O-ring, genuine GM part.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eIf you're not certain this is the right part, drop us your VIN before ordering. We'd rather check it now than have you sending it back.\u003c\/em\u003e\u003c\/p\u003e","brand":"GM Genuine Parts","offers":[{"title":"Default Title","offer_id":49756209479930,"sku":"OBSAE-GMT4-00032","price":209.0,"currency_code":"AED","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/5131\/8266\/files\/Screenshot2026-07-27143821.png?v=1785148882","url":"https:\/\/obscureparts.com\/products\/thermostat-housing-gasket-gmt400","provider":"Obscure Parts","version":"1.0","type":"link"}