s4 suspension arms / bushes

[tino]

Does anybody know what the difference is between the a4 top suspension arms and the s4 arms ? Moog catalogue states all the same part numbers but tps says they are different. have tried a search with no luck .Is it heavy duty bushes ? as i have had both side by side and they look identical . any info would be great .

[am8631]

try www.vagcat.com for part numbers