what 12'' came in the c53 libra's?

[dat521gatherer]

i aquired a empty pair of libra c53"s and they have the 12'' adapter in them with no crossovers the wires come straight through the wood back plate. they also have the tweeter block off plate. ive read and seen many of the systems that were availble like the le8t le14 s11 s12 and so on. before i start playing around with different componets i would like to know what single 12" diver came in these with no crossover? i'm guessing the le12c and or d131? any input jbl'ers? ive been in the jbl library and it mentions the 8'' 10'' 14'' but nothing on the 12''.

[Zilch]

Any of the "C" models would have a crossover, no?

I'm guessing D123.

Looking again, LE12C "fixed" crossover was mounted on the frame, so coulda been that....