Ok. I'm looking to get me a hitch. But for some reason nobody in europe makes one for the K5. So I looked into an american made one. Those are $120 over there where you are. But when they get here they are suddenly about $500. So now I think I will just build it myself. My question is now, can somebody give me the inner size of that square tube. And also that hole where the bolt goes through. This way I can go on, while waiting for the intert and ball. "K5 Grand GT Blazer Silverado in the Netherlands."