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Replacements for OSI Molex PCB connectors:

DIGI WM3309 12-pin molex edge connector  (type KK 0.156")
DIGI WM3509 12-pin vertical molex connector
DIGI WM4410 12-pin header

Potential replacements for 8T26/8T28:

1) note that the 8T28 and 8T26 are basically interchangeable in OSI
   computers, as long as a machine has uniformly one or the other.
   For RAM boards, it doesn't matter which you use: you can use either
   chip, or you can use an 8T26 in one socket and an 8T28 in the
   other.

2) 74LS243 or 74HC243, 14-pin quad bidirectional transciever.  This
   can be used in most OSI boards.  Like 8T28, has complementary
   read/write enables.  Differs from 8T28 in that there are no
   separate inputs/outputs; just A1-4 and B1-4.  The i/o pins are tied
   together on most OSI boards, except the 542 keyboard.

3) Nat. Semi DS8641 (formerly Dallas Semi. part).  Similar to 8T26,
   except pinout is different.  Open collector outputs require
   resistor termination.