I should know this and I swear I've had this sorted in the past but I'm not at the shop near reference materials and can't for the life of me figure out what the era/model breakdown was between 45's and Stout's that used the amber/red and red/red rear lights. I know my 66 LPB uses red/red and I think my Stout was red/red too, it was a 65.
Pics for ref:
Part# LENSR45RR
Part# LENSR45AR
Pics for ref:
Part# LENSR45RR
Part# LENSR45AR