As mentioned, the connectors used here are very common - the square pins on the board are 0.10 (2.54mm) apart, the most common size from the 1960's through 2000.
I believe the specific connectors are Molex KK in 2.54 mm spacing, 2 contacts x 1 row.
The connectors themselves are cheap, but the problem is that if you want to install the connector properly, you need a special crimping tool to attach the contact to the wire. You'll need to find somebody with the crimper, or send them pickups back to Alembic to get them installed.
David Fung