Welcome along Brian, return the questionnaire and will sort you out.

The DMGRS valve is as Steve says smaller and cheaper and is a good like for like replacement. The clubs though is a valve enhancement, using a brass three port valve.

Once a member and while in the shop look at the improved top heater hose. The originals have a habit of popping but if you have had your car for a good time then you may have had it sorted.