well this thread is pretty dead compared to others around here so answers can usually take a little while longer. The arms (if you mean the arms going width wise across the car are the lateral arms. the arm going lengthwise is the trailing arm/strut rod. sadly I've never seen just the bushings available for sale for the lateral arms because its actually a spherical bearing that goes bad, not a regular rubber bushing. and after checking toyodiy.com I do not see a rubber bushing in the strut rod either
for the generation info this can easily be found doing a search and wikipedia has some decent basic info.
anyway you have a 5th gen with a 5S-FE engine
5= generation of engine series
S= block series
F= type of head, this time the economy head(opposed to the G head which is performance)
E= electronic fuel injection
a little more info on engine codes:
Common Engine Swap Guide