Just F.Y.I. to everyone on the Forum that I took my '07 H3 toa local Discount Tire and they were extremely kind enough to put my H3 up on a floor jack & tested the placement of my Right Rear ProComp 35x12.5x18 L/T M&S on a Helo Rim up onto my spare tire mount to see if it would fit should I buy a spare to replace my265.

Not only did it fit, but I neededNO modifications (Spacers, etc.). Not for the Wiper, Not For The Bumper, Nothing!!! OUTSTANDING!!!!!!! .

My Special Thanks to 07HummerH3, for the patience & assistance toward me reaching the conclusion I was hoping for.

I reckon that I'll have my Helo & Procomp 35" upgraded Spare Tire. When it happens, I'll take a photo of it mounted and try to figure out how to post the damned thing.

But, I can categoricallyCONFIRM for those of you thinking of makingsuch anupgrade, that a PROCOMP 35x12.5x18LT M&S Tires on the Helo rim I have (Model # Unk.) WILL fit on the back of the H3 Spare Tire Mount without any spacers, & about 1/4"-1/2" to spare between the tire & the bumper.

One final thought, the Manager of the Discount Tire said that if my Hummer Dealer gives me any rubbish by lowballing me on my Wheel/Tire exchange, I was to call him and he would try &better for me!