When I installed my rear bumper the bolts were a very tight fit too, due to the powder coating. Then I recieved the Skid Row frame reinforcements and had to install the bumper again! I never got a Calmini sticker either!!! Only thing I have poked in the reciever hitch is a shackle and it fit without a problem. I used my exsisting tail lamp lights with the Calmini bumper. I also have the third brake lamp and drilled a hole in the top of the cap and a hole at the base of the up right and pulled "my" wiring harness through it. Then sealed the holes with silicone for a water tight fit.

I can send pics if tha will help?

-Rick