Here is the Singer type SR155 bulky clamp measurements

Here is the Studio Mid-Gauge SR860 Ribber Clamp measurements

Now for the Singer Standard Ribber Clamps

Note:  As some were not to the exact of CM, I did put MM, which when you just take the number in the middle of the ruler in metric and multiply it by 100, you get MM.

If anyone else has pictures or measurements of other Ribber Clamps, sure would appreciate for those that need to find the right clamps for their machines.