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Good eye. Mine are the JR Big Tubes for w2's. I had to do some research way back to figure that out to find the adapter plates. I found out that Hedman bought JR back in the day and that is where I bought my adapter plates for my current headers. Hedman now calls the adapter plates "Hedder Sub Flanges"
http://www.hedman.com/products/?id=3518




I have them on my car.....it was a real adventure the first time I put them together.

I'm pretty sure they were originally available from Direct Connection.

Ed