MZ/MuZ Riders

Are the above of any use on the Skorpion?
Are they plug and play, is there any benefit of the OE?

TIA

short answer: no.

There are several Skorpions over here with that swingarm as well as a couple with RGV parts.

The SZR swingarm is not pivoted on the engine; remember the 4SU (SZR) uses the same chassis as the 4DL (TZR 125 Belgarda) with its dinky 2-stroke motor. It is not difficult to adapt but it is not worth the effort or expense. The aluminum banana awingarm is heavier than the steel one from the the Skorpion (=YFZ600). Also the chain tensioners are
poor, prehistoric design, just barely good enuf for a 125.
Some think the SZR part looks cool; for anyone in the know, it looks dumb. Its is obviously for a V-2 2-stroke and lacking the back exhaust system, there is no possible explanation for the form ( or weight).
BTW, the same is also true for the TZR which is a single. The swingarm is actually from the Tz250 reversed cylinder.
IOW, it is a waste of time.
If you must fool around with such things ( I used the stock swingarm in my 122kg, 80hp racer), the Black Panther part is plug and play. The part from an early FZR 600 can be fit with not too much effort and would give you a better 4.5 or 5" wheel in the bargain. There photos and measurements over at MZOG.

I personally see less than no advantage in wider wheels for street use; quite the contrary. The 4" wheel is already too wide. The '93 prototypes ran the adjustable RSU fork, aluminum swingarm and wheels(3.0 & 3.5"/17") from the concurrent TZ250. Those parts would be idea for those just itching to change and that would be change for the better.
Racing is a different matter. That is a question of tires but you can't legally run any of the various racing tires on the street, even if cost was no object.