A quick dive came up with the LS2A/2's woofer being 160mm (still needs to be confirmed with a 2nd source).
B110 was smaller in my Ls3/5a's (maybe 130-135mm depending on how it's measured).
Found pics of the LS2A/2 woofer backs, but the hand written model # (7-M-3) returned Zippo on Google.
I need to man up to move a couple of mattresses, so that's it for today.
DeKay