Having just taken delivery of the R3T and putting on the Light Bar, I had a chance to check these out. I don't know if the R3 had "pop on/off" lenses or lenses with screws. My America had lenses with two screws to hold them on.
The R3T blinker lenses do not have any screws. There is a small slot that doubles as the drain hole and a way to pop them off.