I tried for many months to find Tamjets Struts on RCCanada. They are exceedingly rare!
Finally, I gave up and got mine from Bajahobbyusa.com
They still have them. You need to get the struts and the matching metal trunions.
Here's the link:
I had to add a shim to mine so that they would be straight, otherwise the wheels didn't fit in the wells. Of course, you have to rework the Habu to fit them. But they work well.
I just flew my Habu last week for the first time. I reached 185 MPH according to my GPS. It is an awesome plane!