It may have another name but used to be “reaction research”. Now it seems the business was sold or changed names. 

https://www.ztrix.com/convertible-kits/z-spyder/

I had a Velorossa at one point. Very fun car as it wasn’t a show car but more of a go car! 

GLWS

1 hour ago, JSM said:

It may have another name but used to be “reaction research”. Now it seems the business was sold or changed names. 

https://www.ztrix.com/convertible-kits/z-spyder/

I had a Velorossa at one point. Very fun car as it wasn’t a show car but more of a go car! 

GLWS

Reaction Research! I been trying to remember that all morning. I bought some fiberglass bumpers from him. He sold high end bicycles and I think was a pilot. New Mexico maybe, somewhere out that way.

5 hours ago, SteveJ said:

The OP might have gotten that from here: http://zhome.com/History/StylingMatsuo/MatsuoZStory1.htm (Look about midway down on the page.), though I have no idea where he got the idea that the hatch had problems with leaks. Perhaps he only has seen Zs with dry rotted window glass seals. Those will leak.

It is in there, isn't it?  A lot of other possibilities also.

I found a picture in the 1972 FSM GI chapter that might show another original concept.  Much snubbier butt, and stubbier front.  (Humor...).