Fuel cell ?

[Drake Racing]

I have a Mastersbilt with the fuel cell that has the corner cut off...anyone know the manufacturer?
I'm building a new can, and want to replace the oval fill plate on the top.

Curt Drake
Late Model #55x

[TheJet-09]

I've seen plenty of them but never owned one. I could be way off, but I thought they were built specifically (or solely) for MasterSbilt, so parts might only be available through them.