I have found this difficult to research.
There is a lot of info out there on Tiger I's, Sherman's etc. but it "thins out' when it comes to the later Panther G's; which of course what an HL Panther is. I was lucky to find the info for my MNH Panther but have not found any other real good bits of data on clours/markings.
If anyone has seen aqnd good resources on the Panther colours from mid-1944 to 1945, I'd appreciate hearing about it.
I know there's a kit available to convert the G to a D and it looks very nice, but it costs more than the tank
"Luck favours the prepared!."