Picked up front and rear bumpers from a M1008 today. Everythings there, will I need to drill some holes for the shackle mounts? Will I need to modify anything else? Wasn't planning on using the rear, but if I did use it what would I have to modify for it to fit? I know the receiver hitch would have to go, anything else? What size are the shackles (screw pin anchor shackles) used with these bumpers? The largest I have is 7/8" and it's too small. The 1" shackles I found are rated at 8.5 tons!