Caps for old Sherwood manifold

[enhydralutris]

Hello. I have a pair of PST HP100s that I purchased at a scuba flea a few years ago with a Sherwood manifold. I'd really like to break them up and use them as sidemount tanks. I believe they're quite old; they have angled valves and fit a 7/8 neck. Is there any way to get the caps to make them singles again? Photo below:

 

[tbone1004]

caps were never made for these valves, sorry.... have to find used valves elsewhere, and good luck...