There are specs listed in the '68 Pontiac Service Manual and the part numbers are listed in the Pontiac Parts Book section 0.519. See: http://www.1968firebird.org/68sm/engmech/engmech9.html http://www.1968firebird.org/number/ec/ec3.html Sadly, I have found some errors in these books so I often look for multiple references on important stuff just to confirm. Anyway, these might help as a source. Jim
