I don't have a web link, but there are several kits of varying prices
that all work well.  You can probably pick one up at your local auto
parts store.  I picked up the cheapest one I could find and it worked
well when I replaced the rear cylinders.  It is just a couple of pieces
of tube that hook onto the bleeder valve and go into a sealed cup.  When
you pump out, fluid goes into the cup and when you release the brakes,
air is prevented from going back in because the tube is in the fluid.

That works fine for a quick job, but if you are going to bleed your
entire lines, I suggest that you get a more expensive kit with a one-way
valve and a larger resevoir.  Still probably only about $25.  Good luck.

Rob
'89 Westy