ACDelco D571A Professional Door Cylinder Review

Fits and works well in 91 Suburbs of Silverado. Easy installation. The key fob holes are small, expect them to be reamed. The metal is softer than expected so don't expect them to last more than a few years. Worth the twenty dollars spent.

I get very frustrated because when you pick an option for your car type and it tells you it fits (it shows it in green) and you get it for free and then it doesn't work, that's real disappointing. Now I have to go through the hassle of returning a product. This time AC Delco let me down.

They work but hard to unlock one. Once accidentally opened the door with the ignition key. Tried another door and it worked. Tried several other keys and every key that went in opened the doors. They will maintain the honesty of an honest man, but they will not stop a thief for a moment.

Item as advertised and fits my 1985 GMC S15. The locks are a little tight but it could just be a remnant of the original locking bar in the door. I had a closed door lock and the key didn't open it twice. I had to use a broomstick and reach through the rear sliding window to open the doors. As I said, I'm not sure if it's the lock itself or the old connector in the door. My old locks worked perfectly until the mechanic lost my keys. They also feel cheaply made.

Bought for my 1994 Firebird. I had to modify them a bit with a dremel to fit my car but knew I had to do that before I bought them. It's a bit hard to explain, but where the clips go (which hold the lock in place) had to be rotated 90 degrees to fit my door. To do this I had to use a dremel to cut two new slots on the lock cylinder so the clip could face the right way. There is an obstacle in my car door preventing me from using the lock and clips without modification.

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…