Does anyone have a source for brake proportioning valves for a 91-95 Sable/Taurus wagon?

It has ABS and I already know that the sedan parts aren't compatible (wheel base). Ford no longer makes the parts. I'm willing to go with used. It's a part that rarely fails, but one of mine did. I figure if I'm going to pull one I'll pull both. It's been too rainy to work on her much and the cluster is smack in the middle of "where you can't get to". God save the queen.

I've got her up on ramps, jack stands, and wheel chocks in the side yard. I'm thinking of putting her up on blocks and slapping a Chevy logo on the front. If I can't find replacements, I'm damn close to pulling them, soaking them in Simple Green, and then plastering epoxy all over the leaking areas. It should work, but I'd rather go with functioning parts.