The Optima is an early version of the original Optima, identified by the early shock mounts and slim wishbones, a production change meant later Optimas had the thicker wishbones and taller shock mounts from the Turbo Optima included. The gear train has been modified, looks like a Robinson Racing spur gear on there. The front wheels are the correct ones. A manual for it can be found here
http://www.retromodelisme.com/manuel...ma-kyosho.html
There is also a copy of the Works 93 mannual on the site
http://www.retromodelisme.com/manuel...93-yokomo.html
Spares for both can be found on ebay, repro bodies for both are available from Team Bluegroove on ebay
http://stores.ebay.co.uk/TEAM-BLUEGROOVE when they return.