Visor target 1 (left yellow) SW-1A-161
Visor target 2 (blue) SW-1A-161-1
Visor target 3 (amber) SW-1A-161-4
Visor target 4 (green) SW-1A-161-2
Visor target 5 (right red) SW-1A-161-3
Those are for the entire target. I don't see any listing for just the rectangular plastic.
I just did a quick search and couldn't find anybody selling these, BUT I would guess the targets for Jackbot are the same and it looks like Marco's has all the colors except blue and Bay Area had the blue one.