Could I get advise on the following Bosch parts and their compatability with a 2.0s otherwise stock..

plugs W250P21
CDI box 0 227 200 001

Plugs
I've searched threads and I think the 250 plugs may be for the non S application? What would be the symptoms running them on an S?
I have seen reference to W265P21 plugs for the S - would these be available today?

CDI
Any necessary mods required elsewhere when changing from points to CDI?

Many thanks in advance.

C.