Are they Phelon coils like this 1954 Neptune AA1.
Guessing an OMC coil could be retrofitted, but
may need considerable machining to make the OMC
coil fit on the larger laminates.
I’d want to convince myself that the coils are actually bad first.
Have you done or had any testing done on the coils?
Have you replaced the condenser and dressed the points
after taking them apart?
Prepare to be boarded!