The OEM 6volts look exactly like the T-105s, except for the color. I once had to replace batteries with NAPAs, they looked exactly like the T-105s I was replacing, cept they were black and had NAPA labels.
Seems strange to me if Trojan IS supplying the OEM batteries, they would want the brand/color to stand out?
This is important stuff, right up there with psi of 17.5 tires/oil brand/truck brand/etc...
2016 Tiffin 40QBH
2005 36TK3--retired, but it was a good one
2017 F450 KR