Hi Kevin and
Your E350, Class C chassis might be different from My Class A Santara but it sure sounds like the same tag setup I have.
Axle & Brakes made by Dexter, the Supension, master cylinder, brake actuator and overall package was provided by Mor-Ryde.
Look for an ID band around the tag axle on the driver's side. This is the Dexter number and they can give you all the parts numbers you might need.
Read the info in this post below for more info.
http://www.irv2.com/forums/f65/hydra...on-101083.html