Name and Size tire original 72 240Z

Today I was doing a little work on my tail lights which I am sill having problems to get working. Blinkers and brake lights work and there is no side marker lights either!! But I check under the rear carpet and checked my spair brand new 14 inch rim with Bridgestone tire could that be original !!!! Any ideas for the lights ??? What was the name and size of original 72 240Z tire and any ideas with the lights ????