Dan G., your middle photos are the earlier version of the 1x6/7 series PTO engagement handle. The top photos are the later style 1x6/7 series PTO engagement handle and the bottom photos are of the 1x8/9 series PTO engagement handle. If you have a model 71 with that style PTO engagement handle it has been swapped out as the 71 would/should have had the older flat, "bar stock" style handle mounted on the right hand side of the steering pedestal.