Alright so I'm looking for some G1 styled Third party figures that are in scale with Studio series BB Optimus Prime and that also they have a realistic vehicle mode. Mainly what I'm looking for is a Jazz, Ironhide, Hound, and Ratchet, but anything else would be great. So far I have found this: I love it, problem is, I don't know the size. The figure above is labeled H2 Minisize Manero.
Kinda surprised you wouldn't want RTS or Henkei Jazz for that gap...hmm...I think Maketoys Maestro is too big for your purposes. GT J4ZZ is also too big but the alt mode is a modern Porsche he looks awesome worth checking out at least.
Yeah, youre best bet is RTS or Henkai Jazz. The 3p MP offerings are all roughly Voyager size. There is also CW/TR/POTP Jazz, but its kinda fugly....