fuel tank msa/fia questions

[RobMatthews]

Im secretly gathering parts again for the track car,so am on the lookout for a fuel tank thats msa/fia approved,

Im not out on track more than 20 mins at a time so dont have to be huge-maybe 25-30lts?

Looking at keeping \'system\' components to a minimum for cost effectiveness and number of things to fail, so do they come with built in fuel pots?

Whats the regs with mounting them in the car or should i cut the spare wheel well out, flat plat it and mount a tank under that?

What have you all done?pics?
Thanks rob