gmqcode - where in NJ are you? I ended up making one last year because I thought my issue was fuel boil. There is no available phenolic spacer available.
It ends up my issue was the carb, so I do not have use for the spacer any longer.
I used the rubber-ish 1/4" gasket that was under the carb as a template, bought 1/2" phenolic material and made my own.
You're in NJ? I'm in Eastern Pa - right across the border. PM me your address and I'll send you the spacer I made.
Just get some gasket material from your local auto parts store and cut gaskets to match.
Here's a pic of the spacer: