unit icons

Im making a MOD that makes Chevalier a French UU and remove Chateau from the game. Unit icon is not showing in Techtree though despite showing everywhere else. everything is properly labeled and imported. BTW which icon the game uses on Techtree is it 45 or 64?

Hello CivFanatics community, As a huge fan of the franchise and mod enthusiast I propose a change to the Unit, Tech, Wonder and civic icons to a more favorable style. I personally love Civ V art style the most and used it as an example. Idk about you guys but to me the game looks a lot more...