it's a T-15 engine. This is really odd because the cars looks dead on like an RS4 RTR 3 Evo, specifically the Dodge Viper model based on the wheels. This particular car uses B021 bearings for the clutch bell. The only 8mm bearing i know HPI uses is B017, but i am not sure if that is the part you need.
can you take a close up pick of the transmission and spur gear?
That kit is an HPI RS4 3, they no longer have manuals online for it. It should be very similar to the HPI RS4 MT2 if you need to cross reference any parts.
Does this look like the old bearing? http://www.hpiracing.com/en/part/b046
If so, they have an updated part set http://www.hpiracing.com/en/part/B019