I found an 08513-60004 on ebay.
Has anyone done an opt 001 upgrade on a non-opt 001 8511A, 8512A or 8515A?
It would appear to be just recabling and adding the multiplexer boards. Of course, I'd also need a 3rd 08510-60102 cable and 2 sets of the opt 001 cables.
Thanks,
Reg