AAAAH... well that's differnt!
Yeah, after lots of e-mails and hounding, Brooks finally made the A-Grip in Kahr P9 and P40!
It looks funny, but I think you'll love the grip!
The small sized Hogue "Handall" will fit, but I didn't like it. It felt great, adding palm swells and a couple of finger grooves, but it snagged on my shirt when I tried to draw the weapon.
FWIW, I've got a P40 too, but with only 45 rounds through it so far, I'm undecided about it's reliability, but the recoil is not nearly as bad as I expected!
I think you made the right choice... Good luck, and be sure to let us know if you like 'em.. Pics would be nice too!