i has single bellow bags on the front of my sonoma when i was 15 & 16 years old and they worked fine!!
they were made by EAI- excentrix automotive innovations
alot of people use them on 2:1 cantilever setups because they dont roll over like double convulated bags can do
VICKS-UTM..SINGLE BELLOW BAGS..KNOW SOMEBODY THAT HAS THEM FOR $50.00..
seth has a picture for EVERYTHING