Super idler and drop arms come in 2 flavors?

There are actually four different types of drop arm. You have the latest version, which came with the stops, whilst the other three did not. You can swap to the older system but you have to be careful, as one of the earlier drop arms will not fit your steering gear. If you check on the splined area of your drop arm, there will be three 'squared' notches which match up with two 'squared splines on the gear. Either the early drop arm with the same pattern or the one with three sets of 'teeth' will fit. The arm that has only one 'squared' notch will not fit.

"There are actually four different types of drop arm. You have the latest version, which came with the stops, whilst the other three did not. You can swap to the older system but you have to be careful, as one of the earlier drop arms will not fit your steering gear. "

It's probably worth mentioning that the new steering boxes offered by top-line parts do not have any 'different sized splines' as mentioned in the bentley. Nor did my original VW box on my 74 super, but the drop arm did have several squared-off splines on the inside of the drop arm. On the new top-line boxes you have to manually calculate where the center of travel is and bolt the drop arm on at that point.

Chris