Well at the time 4x4iron.com was an online friend of mine from the old days @ CK5 and he sold DIY kits for K5s. Basically he lazer cut the 3"x8"x6' main peice then shipped it to me with all the peices of steel I needed to weld it up. It was a very handy kit but his biz didn't survive the test of time.
Anyway this guy has them:
http://www.rockstomper.com/catalog/pieces/hinge.htm
Years ago I bought a rockrod (beefed up tierod for D44 front) from him but I have not bought anything lately. RockStomper has been around for years and I would buy from them again if needed.
www.rockstomper.com