I was just digging through a "Standard Engine Management" brand parts book at the shop, looking at neutral safety switches for a replacement park brake switch, and I remember seeing vac solenoids in there. Pretty small ones by the look of them. May want to run to an auto parts store that still has the old fashioned BOOKS, not just computers for parts look-up, and see what you can find. I'll try to remember to look through there the next time I'm at the shop as well.
As for the check valve, that should be pretty easy to come across. I've seen lots of those on older Toyota cars. Also check "Dorman"
"HELP" application books for those, I've seen them there before.
May save a couple dimes making something work that's off-the-shelf. God knows what a yard might charge, and parts are getting scarce.
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