Trying to order a 600 x 6 Tube for the main tire on a Grob 103 Twin II, and need to know which tube I need to order (which valve is used? ) There are several different types?

http://wingsandwheels.com/aircraft-parts/tubes.html

These are the valve variations:

TR-87 short valve bent out 90 degrees from center (left)TR-67 vs TR-87

TR-67 long valve bent out 90 degrees from center (right)

TR-20 straight valve

90 valve bent out 90 degrees from center

45 valve bent out 45 degrees from center

Thanks for the help!

Tim Hanke
Adirondack Soaring

Saratoga Springs, NY