This is my best measurements for the Nova Rossi's I have: 09.20/C1 .21 and the R528F are 21mm front to back and 38mm side to side. They don't appear to be 1/2 mm.
The R50F I got 21mm front to back and 45mm side to side.
I just happen to have an ASP .32 out and I am not sure if the measurements are readily available but i got 15mm and 38mm for it.