[TenTec] Omni Series question

[ultrafixedwing at juno.com]

Can anyone tell me the difference in the following rigs?

Omni A
Omni A, series B
Omni D
Omni D, series B
Omni D, series C

I've gotten so many different answers that I can't be sure.
Thanks,
Paul
KS2S
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