This is a 24 gram C block for the RC10T6.1 and RC10T6.2. This is the correct narrow C block that does not require any other parts or setup changes.
The extra weight just in front of the rear tires can help keep the rear of the truck planted in loose conditions.
Not compatible with the T6.4 unless you also use a NARROW D block
The extra weight just in front of the rear tires can help keep the rear of the truck planted in loose conditions.
Not compatible with the T6.4 unless you also use a NARROW D block