Review on ACDelco D571A Professional Door Cylinder by Michael Ringgold

I bought these for my 94 Blazer K1500 and was confident they would fit just right. In this case, other sites like Auto Zone and Advanced Auto also showed this version as a direct match, so it wasn't Revain's fault. The problem is that the key ends flare out like they're behind a doorknob. My cylinders fit on the doorknob. Not sure if there is any confusion between the S10 version and the full version or something, but even an Advanced Auto employee tried to hand them to me because his computer told him they would fit. So I'm sure the locks are good quality but no tool would make them suitable for my needs. I'm really just writing this to warn others to double check.