I have just bought a 1973 Westy Helsinki (RHD in the UK). It has a cool box underneath the sink.

Were these models originally equipped with a fridge and if so where was it situated - Under the sink or under the cooker?
Can I replace the cool box with a fridge? Would it be better to put it underneath the cooker so that it can operate on LPG?

Sorry to have lots of questions but i guess most people know lots more than I do about campers!