stock tb size is i think 60 mm its that or 65mm but im more sure its 60mm
the stock maf size for the 89-91 SCs are 55mm maf
the stock maf for a 92-95 sc is a 70mm maf
for a cone filter go and buy one new there lie 70 bucks cdn thats what i paid for mine at Canadian tire
theres no point lookin for a used one cause by the time u find one and have it shipped itll prolly cost the same as a new one would
if u get a discount at an autoparts store close to u go and ask them k&n 9" cone part# re-0920