Yes, I _think_ the hardware was identical - I had an 11/40 for a year or two 'back in the day', before I got upgraded to an 11/45, but it's been a _long_ time since I've seen one, so I can't be positive. I tried to find parts numbers in the drawings, but none of them (11/40, /45, or BA11-F) had them. ??? Mine still has the card guides in place, although the bottom fan assembly is gone? Thanks very much for the offer of help, but let's see what Henk turns up! Well, I did say that the front console was different! :-) But other than that, I am pretty sure they are otherwise identical: same backplane, same CPU boards (although the /45 can be found with both the KB11-A and KB11-D variants; I _think_ the /55 only comes with the -D), etc. My manuals say the 11/40 one is a BA11-FC, and the 11/45 is a BA11-FA. Not sure what the difference is - maybe it's that the /45 has two H742's in it, and the 11/40 has only one? Although I guess those are mounted on the cabinet (although they are in some sense still part of the CPU chassis). Maybe it's the different power harness/etc? Mine looks like it uses 6. Anyway, thanks very much, I have my fingers crossed that you will find both of them when you look! :-) Noel