The SM465 four speeds used four different adapters.The 465/Rockwell 221 adapter was the first.(I will post at a later date).
The second was the 465/205 adapter used from about 1972ish to 1980.
Trans side.
Case side.(again the racetrack/figure eight pattern)
Around 1973 until 1975 they offered the 203 behind the 465.This is the only pic I have at this time.
The 3 speed sagianw transmissions were offered with a 205 behind them as well.
Trans side.
Case side.
In 1981 they went to the NP208 and for the most part got away from the 205's except in the 1-tons.The 465 adapters changed again with the case change.
Trans side.
Case side.
Around 1986 GM went to the round pattern 205's and changed the adapters also.
Trans side.
Case side.
The late 465/205 adapter looks alot like the 465/208 adapter but the 208 adapter will work on a 205 due to it not having any provisions for a shifter(notch on the flange and threaded insert on side.
Now for the disclaimer.I am not an expert nor do I claim to be.The dates are not exact,give or take a year or two, and this is not to say that newer/older parts have been swapped in.These are merely my observations from years of swappin/buyin/sellin and usin these parts.