As aluminum 289 Street Cobras seem to be popular on the forum lately, found this on Hagerty...
https://www.hagerty.com/marketplace/...5-5e69ef794d6e
Not a bad price compared to ordering a new one.
Original Tojeiro style frame is not mentioned, but a front transverse spring can just be seen in the engine bay picture. Big $$$ option I believe.
Cheers