What did YOU do for a rear residual valve???

[ldgn63]

I'm having a hard time finding a master cyl for the disk/drum conversion on my '67. (none have internal residual valves for the rear drums)
So I am interested in what YOU (yes you) did for a rear residual... Even if you tell me that you do NOT have one.

Here are the options that I "think" I have:
1. Keep hunting for a master with internal RV
2. steal one RV out of my '67 master (can you buy the internal ones new?)
3. Add an external RV inline.

Would prefer a variance of option 1 (the sooner the better)

Thanks!
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