Lots of people, me included, use a #20 stainless steel hose clamp. Works like a charm!
Just for reference if a #20 is good for the larger diameter side of the boot what size do you use on the smaller size? Sounds like something good to keep in the parts bag.
Damn, I totally missed the part where you said it was the tulip side. Guess I should drink my coffee before responding to posts in the morning...
The #20 is perfect for the small side of the boot. Not sure about the larger side, but I would think a hose clamp would work there as well. Not sure about the side tho.