I have the exact same car. It is branded as a Robbe 1:10 High Performance Car.
I have bought it in the Netherlands about 15 years ago at my local RC shop and have raced it at their track for about five years. Over the years I have upgraded it to be a pretty fast car, with the Corally engine being the biggest contributor to this.
These cars were pretty popular at my club at that time, due to their high strength chassis and their durability. Mine has had some pretty rough collisions with fences, tires and even lamp-posts and it has never broken down. The only weak spot I can remember are the links that hold the rear suspension arms. As I upgraded the power these would sometimes come lose upon accelerating hard from a corner.
All cars that were racing had touring car bodies. I have never actually seen one with a buggy setup. I started out with the original Opel / Vauxhall Calibra body and later replaced that with a McLaren F1 LM body that I painted orange/yellow to match the original.
They were sold as nitro versions as well.
I have found one on Ebay if anybody is interested
I still have the manual and partts list in the box. I have scanned it to PDF and
put it in my dropbox. Nice to have that I think? You can also see that the 13T gear you were missing was actually a 15T gear... Mine is still complete and running well, but I am very interested in learning more about that Italian shop that still has some parts left.
Could you PM me their details?
Finally, some pictures of my car:
20160322_221507 by
Tijmen Fongers, on Flickr
20160322_221500 by
Tijmen Fongers, on Flickr
20160322_221433 by
Tijmen Fongers, on Flickr
20160322_221404 by
Tijmen Fongers, on Flickr
The original Calibra body
20160322_221907 by
Tijmen Fongers, on Flickr
Later replaced with a McLaren body
20160322_221610 by
Tijmen Fongers, on Flickr
20160322_221646 by
Tijmen Fongers, on Flickr
20160322_221658 by
Tijmen Fongers, on Flickr
20160322_221708 by
Tijmen Fongers, on Flickr
20160322_221721 by
Tijmen Fongers, on Flickr
20160322_221730 by
Tijmen Fongers, on Flickr