Peerless Differential 3/4" OD  x 39-7/16" long, # 100-007B or # 794652.   In stock.

We also stock a very wide range of sprockets for this differentical and Disc rotors in two sizes.

If you add a Disc brake you may want to add:  5/16-18 x 4.41" OAL or 4.10" long HH Grade 8 BLACK. Bolt Part number # 792093

These do not have a keyways. 

These also can be shortened by cutting the ends with a hack saw.

Use one or more 3/4" Shaft collars to secure the wheels.

We may take this apart in order to ship in a smaller box.

You would use a set screw or have a keyway machined where you needed it.

Note:  You can brake both wheel using a Disc or drum Brake from the HUB and have a Disc or drum Brake on each axle so if one lost traction you could Brake that side and send power to the wheel on the ground.

We also sell several sprockets that will bolt to it and has the correct ID and four hole pattern. 8.9 lbs net wt.