speedo gear drive replacement

Hi - i need to replace the drive gear on my 83 1.8 gti  - can somebody advise if it is the red or clear/natural gear i need?

I am running 13" wheels but also have a set of 15" winter wheels so speedo will be out on one set of wheels - am grateful for any advice please

also does anyone know of outlet for these - tried gsf and euro with no joy - are they still available from vw?

Thanks

Ben

I think you need the red one, available from GSF and all that but it maywell be cheaper at VW as you wont pay postage fees.