I just fixed a Breakshot which (when we got it) was found to have had the lockdown receiver's sliding handle broken off and GONE. It was nowhere to be found so there was no repairing that assembly. It had to be replaced. So, since the original receiver is not available (but we still had the original Capcom lockdown bar), I found that a Data East # 500-5020-00 Lockdown Receiver from a Rocky & Bullwinkle works perfectly with the Capcom A-00124 Lockdown Bar. All you have to do to the Data East receiver is to enlarge the two slotted holes to fit the 1/4" diameter carriage bolts on the Capcom cabinet. It's a perfect fit.
If you want to completely replace both of the original Capcom Lockdown Receiver (# A-00125-1) and the Lockdown Bar (# a-00124), use Stern # 500-6881-00 Receiver *AND* Stern # 500-6882-02-00 Lockdown Bar (no button hole).