Amen to that, Maximum Motorsports sells H&R spacers, which are hubcentric and bolt onto the axle. The only issue I had with my 25 mm (1 inch) spacers and stock wheels was having to cut and grind the axle lugs so the stock wheel could be bolted flat against the spacer. That might be what the problem is with the ones you're looking at. Anyway, I highly recommend the H&R spacers from MM.
I ran those exact one on my 03 cobra with stock wheels with no problem. That company is 5 min down the road from me, so i just walked in and bought them. Dont bother calling and asking about them. The only thing those guys know about mustangs is, shipping mustang parts.
Agreed!!! I dropped some decent dollars to get MM's spacers and the high buck $8 a piece studs from MM as well. These, for me, are actually on the front as my new rims wouldn't clear the Cobra brake calipers...needed about 3/8", so I got 1/2" spacers. But front or rear, street or strip, there is tremendous stress exerted...and it's not something I want to have to worry about when I push it into a corner at twice the recommended speed.
But WTF? Apparently, you don't know of the difference types of aluminum, their strength, nor their advantages (and, yes, some disadvantages, depending on the application). But for wheel spacers, why not aluminum? We're talking unsprung weight here as well...