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I would start with 24psi all round and take it from there, dont go over 30psi ish hot
Factors are gonna all be different, car weight, suspension stiffness, tyre choice etc
I use just the upper, I kept the 3 retaining screws to keep it level, and installed 3 x L brackets from bulkhead to dash. also tied it into steering column for additional support.
Armtech would be better.
If your just looking to install the red turn key style switch then you want the 6 pin FIA variant that kills and earths the engine and alternator.
There is a black snorkle drain next to the brake bottle (to right look at it)...however this is about an inch high inside, there is another drain hole to the left that outlets into wing.
MSAR in SE London have large stock, might be worth a visit to try a lid on.
Ref the open face lids, you wont be allowed to use them in open seaters, just incase you might end up going in one ect.
https://www.msar.co.uk/motorsport.html