X-66P-Q-A are still listed in AC-Delco web site under Adhesives then Carb Tune-up Conditioner.

[...] [[...]] or Google 12302501 ACDelco

X66A Aero. can 12302498

X66P pint can 12302500

X66Q quart can 2302501

Do not know for sure they are still availabl... Login to read more.