Info link for Elliot & Reverse Elliot and axles in general:
[
www.theengineerscorner.com]
All D-100 had Reverse Elliot far as I know. Most D-200 had Reverse Elliot except for D-200HD, which would often have the D-300 and up Elliot type axle.
Lighter weight's Reverse Elliot has the ears on the spindle assembly, capturing axle ends, with king pin passing through. Elliot has the ears on the axle with spindle assembly captured, king pin passing through.