Sorry,
Digging a little deeper, it looks like the cam-strap is probably good for everything:
Dive Rite Tank Strap, Narrow w/Low Profile Cam Buckle
unless they trim the "small" kits in advance.
My
guess was the elastic retainer bands are a bit too large for the <5" dia. cylinders, however:
Dive Rite Hose Retainer, Deluxe
Call Dive Rite or DGX to confirm but it looks like it
should work from the component descriptions.
And the shorter AL19 may be too short to work well with this. [Question, are AL19s rented???? I'd figure AL30s and 40s would be more common. I brought my own rigged 19 in checked baggage, so what do I know.]
@jf3193 you could just add the Dive Rite 1.5" cam-strap to your choice of strap kit in place of the SS band clamp to produce your own quick attach/release version and save a
few bucks.