THIS WILL WORK ON THE CT90K1 TO CONVERT TO THE NEWER TYPE CARBS THIS WILL REPLACE THE STOCK INTAKE PIPE ON ALL CT90K2 THROUGH THE 1979 CT90'S (NO_CT110'S_THOUGHT) YOU CAN USE THE STOCK AIR BOX THEN TOO. I HAVE THE RUBBER AIR TUBES GOING FROM THE REAR OF CARB TO THE AIR BOX COMING IN THIS SPRING OF 2013 S1134 @ CARB_INSULATOR NEW_ORING_TYPE CT90_70_TO_79 ATC90_READ others_too 48mm_C/C 20.5mm_CENTER (300008)CENTER TO CENTER BOLT PATTERN 48MM LARGE HOLE 20.5MM 4mm THICK NOT COUNTING O-RING This insulator will work perfectly on CT90's (1970_K2) thru 1979, don't forget the o ring it's sold separately (223H) see below WORKS FOR ALL ST90'S ALL CT110'S ATC90'S IF YOU NEED AN INSOLATOR THIS WILL WORK, BUT IT WILL BE ON THE CARB END, AND NOT THE HEAD END OF THE MANIFOLD This will also work for all stock TRX90s THE STOCK 1970 TO 1977 CT90 INSOLATOR 16211-077-306 IS DISCONTINUED, SO THIS IS WHAT WILL WORK. 300008 @ 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 @ *CARB INSULATER FITS ALL CT110'S (ATC110'S_79/80) 48MM_C/C 22.5MM_CENTER 16211-943-306 1/22A (R2056)THIS WORKS WITH OUR 300001.5 AND TBQ22KIT INTAKE MANIFOLD VERY WELL!! THIS GOES BETWEEN THE CARB AND INTAKE MANIFOLD AND IS FLAT ON BOTH SIDES. THIS FITS THE CT110 CARB JUST RIGHT!!!!!!! R2056 @ *INSULATOR GASKET WITH_22MM_ID AND_48MM_BOLT SPACING 16212-943-306 1/22A (219D) 219D NO LONGER AVAILABLE FROM DRATV @ *INTAKE MANIFOLD TO_HEAD GASKET CT90K0_TO_77 ALL_ATC90'S ST90'S 1/19M (38G)THIS GASKET GOES BETWEEN THE INTAKE MANIFOLD AND THE HEAD ON CT90'S K0 THRU 1977. ALL CL/SL/ST/S 90'S 38G