Bad gas leak where filler neck meets tank
 

I have an 88 z31 with a bad gas leak where the filler neck meets the tank. I have searched online for diagrams or videos of a rebuild. I've also looked for rebuild kits, gaskets, or anything else. I have been unsuccessful in finding a solution. A previous owner did a terrible job at resealing that gasket. I bought a fuel resistant gasket maker and metal putty , but I would love to save the headache if I can buy a real gasket. Does anyone have any ideas ?

Update: During my attempt at resealing the leak I discovered that it was much worse than anticipated. Resealing the assembly isnt an option, im going to have to put a new one in. Still no luck find anything online. Does anyone know what size bolts attach the filler neck to the tank ?

I am in the same boat. BTW who the f!$k designed this tank?
I found a 11 gal corrola tank ( I think I will have to look again ) that I believe can work , fill on R about the same dimensions may put together a fuel pump. Or by that assy.
They z31s are Na as far as I found.

Found some replacement bolts, I think im just going to tear it down and try to do a better job sealing it up. The rest of the tank is clean. Its always fun trying to figure out what people were thinking when they tried to fix a problem. Hoping to figure out what size o ring was on there originally. Worst case it leaks less until I can put a different tank in.