All early derbis, up to 81, maybe 82 have piston port motors. This is SL, SLE, TT, C5, Laguna Sport. Also the earlier versions all had 17" wheels, either mag or spokes (including ALL TTs).
Also, much of the transition bikes (80, 81) have piston port motors with the pyramid reed block cast into the cases but blocked out, so they are still piston port.
I'm sure there is a bounty of color combos, options (like the backrest, harley foot pegs, skid plates and more), on top of different motor combos, let alone drivetrain combos (not all derbi brake plates are the same, especially the rears). Everything derbi is a crapshoot and I think it'd be impossible to document every detail through the years.