[lolife99]

JACKPOT!
Finally figured out what Boss Wheels did.
They designed these wheels to fit the 1" thick "Light Duty" rotors.

I had the answer under my nose all the time.
After seeing mentlmidget's pics (thanks again for posting and helping me solve this issue),... I decided I was going to go to town and buy a new 1" thick LD rotor to try my wheel on.

Then I remembered my extra '83 swb chassis I have. Luckily it had the 1" rotors on it. So,... out I go first thing this morning to check the fit.

THAT'S IT!
Done.
Problem solved,... for me anyway.

I hadn't order my new drop spindles yet for my '86 Dropmember Project,... but now I know to get the light duty version from Belltech.

This does cause a problem with me putting these wheels on my '69,... since I already have the 1.25" thick rotors on it.
It also means that anyone wanting to put the OLD VERSION of these Boss 338 wheels on a 63-72 with a 5-lug conversion,...
will have to use the 73-87 only, 1" thick rotor drop spindles or use a set of factory stock height 1" thick rotor spindles.

You can also see where the stock dust cover pushed out the Boss centercap about 1/8".
I think this can be fixed by using a hammer to dent the cap.

To say I'm happy is an understatement!