Re: 33 16v suspension
My 1979 sud has 16v struts, arms and crossmember. The difference between the s2 33 8v strut and the s3 16v strut is the thickness of the shocker top, hence the size of the bush in the top mount rubber, the top mount bush is alos a different shape but still fits.
My S3 33 has struts/shocks from a S1 33 fitted to it.
In both cases above, the S3 33's were 1990 H plates.
using 33 struts on a Sud may require slightly longer springs, depending on how low your springs already are. The spring pans are different.