Well, check out the part numbers of the disks in the machine now.
lscfg -vl hdisk*
and see if you see 07N3712, 07N3711, 07N3674 as per dmgi's website. It says there that it's a B50 disk, but I've seen the same type of disk modules (with blue lever on left) in an S80 also. Perhaps it is als compatible with your machine.
Check info on previous posts - compare connector types and number of pins etc.
HTH,
p5wizard