THIS IS AN OEM HONDA PART THIS HAS A 48MM BOLT PATTERN AND A 17MM INLET OPENING THIS USES AN ORING SOLD SEPARATELY OR YOU CAN JUST USE A PAPER GASKET (NO NEED FOR BOTH) 314H @ e ."O_RING" FOR CARB FLANGE TO MANIFOLD ALL_TRX90 CT90_78_TO_79 FITS_300008 INSOLATOR 1/22P (223H/1004E) THIS WORKS FOR THE BOTTOM OF OUR 215S MANIFOLD TOO 223H/1004E @ *GASKET CARB INSOLATER CT70K0_TO_77 (ATC70_73&74) 48MM_SPACING 17MM_CENTER_ID 16201-098-010 1/22M (31C)THIS GASKET GOES BETWEEN THE INSOLATOR AND THE INTAKE MANIFOLD ON ALL MODELS. 31C