TS412 = installation in front of axle, for AL-KO chassis with the M design on the longitudinal frame, height a > 184mm, TS421 = installation in front of axle, height a = 125+184mm.
for axles AL-KO, suspension: hexagonal rubber suspension, axle profile 97mm, type Compact from year of manufacture 1995, type Plus from year of manufacture 1999, colour black.