Hello. I recently picked up a pair of mismatched Heresy 1 speakers. One is from 1975 and the other one is from 1982. I took the backs off and the 1975 one has a type D crossover and the other one is type E. I want to replace the capacitors, but I am curious if the ones on the 1975 one are original or have been replaced at some point. They are dark brown and round with no markings.