What's the difference between the different VTC-207-* type clamps?

What's the difference between the different VTC-207-* type clamps?

You have the following versions:

VTC-207-L
VTC-207-LB
VTC-207-S
VTC-207-SB
VTC-207-U
VTC-207-UB
VTC-207-UL
VTC-207-ULB

The first 4 clamps have a solid arm, while the last 4 have an adjustable arm.

As for the solid arm versions, you have the letters: L and LB, S and SB.

The difference between S and SB, as with L and LB as the way the clamps are mounted: L is mounted horizontally on the panel, while the LB version is mounted vertically on the panel:

This also applies for the U and UB, as well as the UL and ULB versions.

Difference between L and S (or U and UL) is in the length of the "arm":