One size fits very many, but not all. I know for sure
that the PDP-
8/L, PDP-8/m, PDP-12, PDP-11/20, PDP-11/40, PDP-11/45 and VAX-11/780
all use the same xx2247 key. My PDP-11/24 has a silly plastic "anti
static"
key, but the xx2247 works there, too. But my PDP-11/05 and GT40 use a
different kind of more "normal looking" key.
Well at least he will get something for his $100... I always feel bad when I see people
bidding on IBM 5170 keys... Those matched the lock they came with. I am sure IBM must have
had only 10 or 20 models but I have never randomly been able to lock one of my machines
with a random key...