Re: Wheel Bolt circle
i know this is somewhat beyond the scope of the question at hand, but it might be useful to have if someone is doing some searching in the future..
as a general rule, any rwd GM car with 5 lug wheels since at least the 50's will be a 5X4.75" bolt pattern- up to and including the brand new Corvettes.
they used a 7/16" stud until '80, and went to a slightly bigger 12mm stud after that.
the new Camaro, Pontiac G8, and the 04-06 GTO use a slightly smaller bolt pattern, but the difference is on the order of half a millimeter smaller..
every S series truck ever built from '82 until they were phased out in '04 or so had the 5X4.75 bolt pattern.
the full size cars with HD suspensions (wagons, cop cars, etc) have the bigger 5X5" bolt pattern with a bigger center pilot hub diameter, and the 1/2 ton 2wd pickups up to '98 also used the 5X5 wheel bolt pattern. they had 1/2" studs up until the late 80's or early 90's, then i think they went to the same 12mm stud as the cars after that.
the smaller 5X4.5" bolt pattern was (and still is) popular in passenger cars with Ford (rwd cars and ranger trucks), Mopar (fullsize fwd like the LH series Intrepids and what not and all rwd cars including the new Chargers and Challengers), AMC, and trailer applications.
you don't plan sincerity.
you have to make it up on the spot.
wanna hear about 20 years ago when i was too smart to know any better?