Russ, the dual headlights on SP units with all the gee-gaws and hootisies are smaller than most. (From playing with a new "diamentional measuring program" on the 'puter. Slick as the "depth of focus" programs, and will tell you all kinds of stuff.) IMHO, the Sunrise dual headlight is too big for an SP switcher, maybe 20-25%(?) We once had some brass detail parts just for SP units, but they're long gone. I think they came from Detail Associates, but I'm not positive. ??? Sorry. :'(