Need good part number(s) for the o-rings that fit the LT1 fuel rail crossover tube. Dealer and parts houses are no help. They always supply the wrong O-ring. The GM part is discontinued. Dorman has no number for this part. I am reduced to trust using salvaged 25-year-old rings from donor cars. 95 Impala w/LT4 manifold, Borla &K&N, 96 9C1 police fully equipped, 94 L99 detective car. $25,000 car (new) stopped dead for a $2.00 part. Dealer will not work on cars over 10 years old--20 if they bought from them. No walk-in parts sales either. Welcome to the new GM. 9G35.