Diamond T model numbers

[Rolf S. Ask]

As far as i know (correct me please) the first Diamond T delivered to US Army during WW II was the Diamond T 967 (1940/41) (except those "civilian" models delivered).
But also the Diamond T 980 (and 981) was delivered very early in 1940/41 (to the Commonwhealt only?).
Then there is all those others, like 967, 968, 968A, 968B, 969 (wrecker), 972 (dump) and 975 (A) (the long one)
Were there any system in the seequence of those numbers?
Did the numbers follow the delivery seequence?
And when were the first ones of each model delivered?
Anyone having a list of serialnumbers/delivery dates?
Any kind of info most welcome!

Any place sheeding some more light on this?

Chers

Rolf