No longer required as I made one from steel
Design for an mx5 sender and non return valve. Had a few small leaks which I patched with JB Weld. holes in the top have been cut to take the mx5 sender and non return valve. I bonded on the mx5 tank flanges with JB weld. This did not work both have come loose, but the non return valve is still intact atm. It has been painted with undersell also, which to my surprise is not petrol proof so you may want to remove this.
Looking for £60. Please note this tank has never been brimmed so there may be other small leaks i don't know about.