There's a one time publication called "Giant Steps" that you may be able to find online if it's still in print.
In it, one of the articles covers how to make your own oleo struts from scratch. In this case, they discussed it with regard to making them for a 1/3 scale Emeraude but it isn't difficult to modify as necessary.
This is probably what you're looking for because the assemblies consist of a spring loaded tube inside an outer tube and incorporates the necessary retainer stops as well as the scissors assembly to keep the wheels pointed in the right direction.
Highflight
Add Edit: Here 'ya go. It is out of print but I did a quick search and found you a used copy at
http://www.amazon.com/exec/obidos/AS...613383-4334532