Seat belt mounting points are not too bad unless you can find a proper ground somewere in the back of the car

Don't use the mounts for shocks as they are bushed and therefore insulated

just hunt around and make sure its nice and paint free since cars tend to be dip painted for some layers
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P.Allison fixer of big engines Mk2+Mk2a signed by God / Hacked by the Lord Aberdeen Scotland