Bought these as a long shot to fit my 1980 RM250 as it isn't listed as a supported ride. They fit great; only issue was that the included bushing set didn't include a pair small enough for the upper bolt holes.
The springs can be easily installed by hand without a spring compressor if you have a helper; one person pulls the springs downward and the other drops the retainer in.
Total assembly and installation time was under 45 minutes without a stand for my bike, probably would have been half that if I had one.
this is the third set of progressive 13 series shocks that i have put on my maico bikes.they work great and are a great bargain for anyone who cant afford to spend 600 to 1000 dollars on a pair of shocks.i would suggest heavy duty springs no matter what your weight.