Nikon F2SA
AI version of the F2 Photomic is the F2A

AI version of the F2SB is the F2AS

But where is the AI version of the F2S ?

Here it is. I made it to have an AI version of a LED meter F2 finder that would out last me. (The DP-12 uses a very weak ring resistor which wears out quickly and there are no more spare parts.) The DP-2A I made uses a tough wire cladded ring resistor, and it's many times more durable than the DP-3/12 ring resistor. It looks very nice too.
The new F2SA next to the old F2S The DP-2A uses the DP-2 electronics and ring resistor, but uses the DP-11 prism and front mechanism
A DP-2 front plate and two DP-11 front plates were used to make the the DP-2A front plate