The blue were called "perma-torque" and didn't need to be re-torqued again. I believe it was some kind of Teflon coating. I schmear Ultra Black on everything so it is all the same to me. https://fme-cat.com/livedocs/PermaTorque.pdf
The White are from an old Corteco set. I believe there was three. I may have a black one from an old Detroit gasket set. I believe my Felpro 307 set came with two, probably one for the FWD Tornado. Match it to the one you take off the 307.Are they all different ?
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