https://www.inlinetube.com/products/inl13148?
1964-1977 GM A-body, 1967-1975 F-body, 1968-1974 X-Body Factory Exact
1-1/8" Sway Bar Bushing 2pc
If these truly don't fit I see several different molded Corvette ones for sale out there.
https://www.mamotorworks.com/corvett...bushing-46795?
https://www.corvettepacifica.com/pro...h-each-68-82/?