Brodak makes a tank that will fit. I think the 3 1/2 oz profile wide wedge will work. You will have to revent so that pick up tube is flush with the front of the tank. Move the engine as far forward as reasonable. Kraft Hayes makes a 3 oz plastic tank, but I think this is no longer available. The Hangar 9 PT 19 CL will fit if you have one it is about 2 7/8 oz.
Brodak 38 Special aluminum gear works well and is pretty light. You will need a spacer to keep the screw heads from puncing a hole in your tank.