I tried Googling for Bruline and got a lot of stuff, but none was a Bruline website. Some are related to beer, shockingly! I suspect these are actually made for air tools, but could be wrong. You can get them at Tower, Hobby People, and maybe even your LHS. Since you just stretch them over the venturi, they'll fit most engines, but maybe not all. You can also apply some patches of nylon stockings with a wire tie or neoprene o-ring. Don't bother with a rubberband.
Steve