Unfortunately, it is not really clear in the catalog which fitting with and which without a plastic spacer belongs to which order number. Anyway, I got the one with the plastic spacer. The processing is good. Because the two axes of the cardan joint are not in the same plane, you have more degrees of freedom with the tiller extension than you need. This means that the operation is somewhat imprecise.
I suspect the fitting without the plastic spacer works better.