"20L" is an early 110 RHD axle.... The 7754th one made. The number will let you match against part changes in the parts catalog (which can be easily downloaded). Of course, keep in mind that in 27 years, you can never be sure what parts are on it.
Pissing people off on the "net" since 1983.
Land Rover. Turning owners into mechanics since 1948.