You probably already know about it but autolite has a rebate on their plugs.
I was ordering ap985s at the time so I wasnt really paying attention to the others but I believe it's a 2.50 rebate a plug for the xp's.
Gotta question for you.
For the brake clunk you have, if you jack up the side making the offending noise and push/pull the tire in and out can you move the axle shaft in and out of the axle a small amount?
Incompetence in motion
96 XJ 4dr, 4.0, AW4, NP231,
87 Wrangler, 4.2, TF999, NP231