MpBrakes said no.. but on their site they also write that almost all 14" don't fit!
But they also hang all calipers to the rear although many cars would work BETTER with them on the front.. I think they just don't wanna take any risks and are too lazy to care with unhappy customers where things don't fit so they always say no.

That was also my thought... but then a 68 rim is maybe different than one from the 70's?

I will try to measure my 11.75" today... on the moparaction site you don't find m any infos but the bracket different. the 10.97" uses 3-1/4" and the 11.75" 3-5/8". Difference is 0.375" so I should have more than this space between caliper and rim, although I think the space is less on the 11.75" with the 15" I got! So that would mean that the 11" doesn't fit...