You can still get original booties from RBC Bearing co too. They just don't advertise them.
I replaced all of mine 6 years ago or so, and noticed that one of the large lower inner a-arm boots was crap already! Grease hardens the rubber. Originals that are hard CAN cut you if you are not careful!!! Beware!!!
These just work to keep grease in, and dirt and water out. They DO make it a PITA to grease the Unibal joints!