I just picked up a set of new torsion bars for my a-body. I'm trying to figure out what I have. They are new, never installed. Picked them up at a garage sale for $100. Here is the number on them P4532450. Can anyone tell me what size they are, and if they're small block, big block, or what? The Dodge dealership in town says his alpha numeric catalog skips over that number. Is there a way to find out if that number has been superseded by another? I more curious now than ever. Thanks