Group size, 42.
12 volt
It's under the rear seat, behind the passenger.
1967 and later models have 12-volt systems (12-volt battery) !!
Passenger side, behind the manifold.
No.
First unhook the battery. Then put the key in (you need it!) and turn it to "on." Remove the steering wheel and the ignition switch just slides out.
It's under the back seat on the passenger side. Make sure the terminals are covered before you put the seat bottom back in the car--if the seat springs hit the battery's terminals, you will be very sad.
165R15.
1500 rpm.
Yes
1600cc
1974 was the first year of energy absorbing Beetle bumpers. You can't use earlier bumpers on 1974s.