[frankym]

I just did the install last weekend on spf 1005. Where you feel the recess in the carpet high behind the seats, use a very sharp utility razor and lightly perforate the recess and you will feel the razor cut right through the opening in the fiberglass. I used 3/8 inch bolts approximately 2.75 inches in length. both rear wheels come off in order to access the bolts. If you go with a metric size thread, you can probably go bigger than 3/8. Half inch will fight you quite a bit. Use hardened steel bolts and 3/8 should be fine.