It is very important to choose the right radiator cap and recovery tank to complement your cooling system. You may also need a special fitting, bolt kit, or even a bracket to make your installation a pleasure and not an unhappy memory.
A proper size coolant recovery tank is recommended and also environmentally safer than an overflow tank. Be Cool has many models, with or without filler necks, to choose from. Details:
Fabricated Aluminum Vertical Recovery Tank and Cap
8 Inch x 5 Inch x 3.5 Inch w/ Passenger Side Inlet