Scrapping or converting a 1979-1980 D50, MightyMax, Arrow, etc?

If you know anyone who is scrapping, converting brake system, a 1979-1980 D50 or Arrow or etc, could you please either let me know how to contact them, or if you are the one?

I need a brake system proportioning valve, the stock one, which is up behind the gas tank.

Thanks!

Dang I just threw away my 2nd gen one away a week or two ago. Not sure it would have been the same or not anyways.