Will this work with the older non IS version of the EF 100 2.8 USM lens?
Unfortunately no, Canon specifies compatibility only with the EF 100 F/2.8L Macro IS USM.
It should but cannot be sure.
As the main feature is the attachement to the lens through pressure. As long as the old lens has a similar diameter to the new lens.
My suggestion: take your lens to Adorama, ask for the mount ring and see if it fits.
The Tripod Mount Ring 'D' is for the EF 100mm F/2.8L IS USM Macro only and is not compatible. The tripod mount for the EF 100mm F/2.8 Macro USM is the Tripod Mount Ring 'B' and is the same mounting ring for the 180mm F3.5L Macro USM and for the MP-E 65mm F/2.8 1-5x Macro.