Thanks for that, I've found the adapter on the Inon site with that description, and as it does Ultralight 1 inches, it should do the Ikelite arms nicely.
Unfortunately I think Ikelite strobes and myself were not to be (I know plenty of happy Ikelite users), I've had one of the 125's back a few times, a sensor failed, hotshoe failed and a sync cable busted (my fault).
Despite "Above and beyond" service by Ike to those issues, since I dive twice a week with my camera, its begining to bug me, and I'm therefore ready to try an Inon.
AengusM
Edit; Stuff the Inon's, Ikelite got the strobes repaired and returned so fast I haven't had time to follow up the Inon's, back to 2 strobes again, Yipppeeeee!