Looking for 9' stepside bed specs

[wcstory]

I gave up on the idea of finding a 9' stepside bed so I'm looking to fab a set of 9' stepside bed sides for my 2500 dually. Right not she's riding around with an 8' 73-87 bed, this leaves a 6" gap between the cab and bed.

Would one of you literature gurus happen to have some body specs on 9' stepsides.

I need to draw up some specs to send to my local fab shops. The round rail lip will be the hard part.