I bought a lot of those shutdown valves from a surplus house and sold ~7 on ebay over the last 2 years for ~$70. Might be able to repeat, but they sold very slow and I don't like risking fussy M-B owners complaining and bashing my good feedback. They were made in India, which turns off half the people here even if from the same plant that makes M-B branded ones. I offered a 1 yr warranty and only one guy complained it didn't hold vacuum (I tested all). I told him to put a nail in place of the stop valve and see if that holds vacuum. Never heard back. Some people have no diagnostics skills, which are the ones I don't want buying and fussing. If enough interest I might risk moving another batch, though P-P wouldn't appreciate the competition.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans