Rear suspension trailing links:
   
 
On the Links page there is a fascinating link to http://www.bnb.co.nz/locost/rearlink.html - where you will find that the trailing links from a Nissan Bluebird could provide you with fully adjustable rear links for your Locost. I haven't looked into this, but it is worth someone's time to do so.

Rear Links - 8K