What do you use for actually sticking your template to your actual leather holster? Velcro possibly
I just have it wedged in between the two spots where the band connects to the backing; just make sure you make your board a little wide so it will sit snugly inside the holster. The is essentially how the screen-used gizmos for both films were secured.
Personally I've gone with two white fobs, it's really difficult to know the proper colour on the screen....it's either white or gray
The fobs were definitely a light grey. The prototype belt that was on the mannequin with the Super Hero pack at Sony had some white fobs, but all of the screen-used ones appear to be grey. The Venkman belt from the Sony Archives still has a grey fob on it to this day.