Bumpage was Bolle's exciting announcement his project: equipping his tall naked DiiMO form factor ProtCache Adapter with the addition of a MacCon clone in the blank real estate on the PCB.
Going from memory in a hurry during lunch: LC PDS is 96-pins, same connectors used for NuBus. IIRC the LCIII moved to a 120 pin interface (same as 030 PDS Connector) with at least a couple of rows of pins missing for the two part connector extension setup. ISTR the Quadra 630 PDS moved on to a full 120-pin implementation, but most LC cards were missing the 'gate" at the extension end of the connector by then, so they work fine in the longer full 120-pin implementation of the Q630 series pin compatible with the original LC PDS.