[gsnopoint]

Does anyone know the difference in the scaleauto guides sc-1608 and sc-1608b. The 1608b states for Ninco track, but what is the real difference between the 2 guides?
The depth of both guides are 7mm & shaft 3.5mm.  Is it the length of the guide or thickness?   Can't find the info anywhere.

[Savage GT]

Looking at pictures, it seems the "b" version is shorter at the front with slightly different shaping, and has a spring included.
How deep is the slot on Ninco track ? 7mm seems deep for plastic ...