measure your remaining driveshaft and ask these peeps in the links below to measure the ones in the packets as a lot of tamiya cars back then used the same size parts...
http://vintage-tamiyaparts.com/CMS/p...2hs5dneijthk94
http://vintage-tamiyaparts.com/CMS/p...2hs5dneijthk94
http://www.ebay.com/itm/9415200-Tami...#ht_500wt_1202
http://www.ebay.com/itm/9400860-Tami...#ht_500wt_1202
the boomerang parts above should fit as the boomerang used most of the parts from the hotshot,
below taken from wikapedia:
The Hotshot, released in 1985, Tamiya's first four-wheel-drive off-road buggy. It broke new ground for Tamiya and also enthusiasts, and was the car to beat in 1/10-scale buggy racing when it was released. It featured four-wheel independent double-wishbone suspension, a unique mono-spring suspension that used only two springs for the entire four wheels. For its time, the car was light, rugged and upgradeable. In the years that followed parts of the Hotshot were evolved and reused in several other 4WD buggy models including the Hotshot 2 (which was identical aside from simpler direct rear suspension), the Boomerang, the Super Sabre and Tamiya's 10th Anniversary car, the Bigwig.