So, I picked up a TL-6500 and PS-55 pretty cheap on Ebay. I found this holster for the screwdriver:
https://products.asg-jergens.com/item/asg-product-groups/electric-screwdriver-tool-holsters/65641

I could not tell what size it was, how the driver would fit in it, etc. I found another link with the rough dimensions so I thought I'd print one to see if I liked it. To be honest, I think I like it just hanging from a hook screwed into the side of my bench better. I figured I'd post this though, since I couldn't find anything here when I was looking. I printed it at 100% thinking that might make it stronger? May not be needed though, seems pretty sturdy for PLA.

I used this link for rough specifications:
https://www.expressassembly.com/catalog/Electric-Screwdriver-Holster-EAAHD3

The perfect solution for those situations when a tool stand and balancer cannot be utilized. Recommended to protect your investment and keep your workbench clean.

Suited for various electric tools (straight/pistol type), big and small size
Easy to keep the tool in the ready to use position
Fastens to edge of work surface with 7 screws
Keep the tools clean
Protect the tools from scratches
Top Width: 2.2 inches (56mm)
Bottom Width: 1.3 inches (32mm)
Net weight: .56 lbs (255g)