I made some bumpstop brackets for mine - i don;t think the AVO shocks have them built in (SSL recommend another type of shock which has a built in bumpstop, negating the need for additional stops, like I've made or the ones Rog sells)
PJB was under the impression AVO's didn't have compression bump stops but I found my (front) ones did albeit polyurethane. Nevertheless he persuaded me to use the Spax gas shocks they spec with their front RS kit. Assume rear AVO's do as well - easy enough to check - just pull back and release the soft plastic dust cover.