FOR WHAT ITS WORTH !!!!
We considered Robart's #145 to replace the byron units. They are not a direct bolt-in and Robart makes no claim that they are for this plane. They have the same basic configuration and could possible be adapted to fit, dont know, never pursued it. Robart was very helpful. they sent a full size blueprint for us to use as a reference.
The byrons work fine with the new cylinders. Plastic is much tuffer than we thought and takes a lot of abuse. The problem is that the strut angle does not set the wheel forward of the leading edge to help the tip over on a rough field.
The Robart configuration does not appear to allow for forward struct angle adjustment. Since the mount is preset in the wing it would be tuff to modify. If you built the Ziroli wood kit you could probaly adjust the mount within the wing. I consider the Ziroli a better overall plane - but the wood kit will require much more building effort. I did set the struts forward on my Ziroli Corsair and have absolutly no problem landing on the same field conditions.
Good Luck