Robart .15-.40 size should fit with very little, if any, mods needed. For the Supra's, check with Central Hobbies, Singapore Hobby or Hobby Net Japan. I see them on the Hobby Net Japan site. Browse down the left had side to Main Landing Gear, then OK Models Randinggear (no, I'm not making this up). There you will see the Supra 30 size listed. I haven't ordered from these folks myself but several others here have and have repeatedly say the deal went smoothly. I have ordered from Singapore Hobby, http://www.singahobby.com , and they too are top notch.

John