actually, Patricks may not have the linkage. They seem to only have a linkage that works with Offy intakes. I called about a linkage for my Tattersfield and they said their linkage would not work
You can get Carter W-1s for $5 and up on ebay in decent shape, but it's hard to tell what year they are without the tag... and they're ALL missing the tag. If anyone knows a good way to tell, I'd LOVE to hear it because I have several I'm scrounging parts from.