These tanks are usually located on the LH inner wing(TR2-3B) or beside the battery (TR4-4A). Revington TR usually use RTR1050ALL for both LHD and RHD TR2-3B cars mounted on the LH inner wing but instalation is a matter of personal choice. The catch tank is not included in the kit. See below

The kit includes
A pipe to replace the standard TR2-4 breather pipe from the engine block which is open at the top rather than the bottom.
An oil resistant hose ½" internal diameter with a 90 degree end to connect the rocker cover to the oil catch tank.
An oil resistant hose 1" internal diameter to connect to the engine breather to the oil catch tank.
Suitable clips and fitting instructions.

The oil catch tanks listed below have inlet spigots of the correct size to accept these hoses.

Additional parts that may be required for this kit are:
1 x 138530SS Adaptor to tap into ally rocker cover
1 x WF524 Fibre washer