Need Disc/drum combination valve------

OK, I spent the time doing due dilligence on the brake forum about the disc conversion thing. I am putting 70 Duster KH discs on my Barracuda and I really want a factory combination valve to replace the existing drum/drum divider block. I am using a 71 Duster disc/drum MC and have run my own brake lines before so that is not an issue. One of you A-body guys who changed from the SBP KH setup to the later LBP setup must have one around you are willing to part with for a price????????
Let me know, I am ready to buy.
Rat:-D