GMT900 HD w/ K2XX Bed Bumper Hitch Questions

[SixLitreRoy]

Hello all. 

 

I recently purchased a 2009 Chevrolet Silverado 2500HD. The previous owner did a bed swap, taking the utility bed my truck had and putting his bed on my truck. It's a K2xx long bed on my truck. There is no rear bumper. 

 

I've been reading and seen many conflicting answers on which bumpers I can swap on. First, does the bumper I put on need to come from an HD truck, and 2nd: will a bumper from a GMT800 truck fit? Would it need to also be from a 2500/3500 truck? Would any of these interfere with my hitch? (Hitch came unattached so I''m not sure if I install the hitch after the bumper or before.) Doing this on a tight budget so have to be careful which bumper I buy. Thanks so much for reading.