Looked at both pictures but just don't see what you're trying to point out. Sorry.
However, if you're interested in looking up parts numbers, take a look at
http://www.fredbeansparts.com/. This is a really cool website that sells GM factory parts. They've got an online catalog that has everything -- and you can hunt around and find stuff pretty intuitively. Best of all, their prices are far below that charged by dealers.
As for lowering the car, I've never done it. Partially because I don't like the look, partially because driving a lowered car is a real PITA because you're banging the front end on something -- and partially because the ride is too rough. If i were you, I'd look in to a Pedders suspension kit. They're from Australia -- and have made kits for Monaros and GTOs for years.
http://www.peddersusa.com/ should get ya started!