Would you mind sharing the dimensions of the bump stop if you still have them? Iím about to try to fabricate a replacement for the missing right hand one on my Duetto and donít quite trust the measurements Iíve taken from the left side.
This is the quick sketch I put together when I measured the one remaining bump stop I had.
I didn't include the dimension of the flange at the top, but it was probably about 5 inches in diameter.
Don't make the diameter of the cone any larger than 3.75 inches at the top. Otherwise the spring seat won't fit.