ONE SET, 4 GASKETS. Condition is New. Shipping included with USPS First Class Package or free local pickup. These gaskets are made from cork-rubber material, much sturdier than paperboard, most times they can be reused repeatedly. OEM ones usually tear after one use. Identical dimensions to originals they have a perfect fit. THEY ARE LASER CUT. Only need to drop them in and screw them down. They fit Mercruiser 502 / 454 Plenums.
Inside dimensions are 3.5 x 3.75 (31/2 x 33/4)
OEM part number is 27-805522A