I must have been lucky as I don't remember any difficulty with a plastic cap.
As a recap what I did was;
1) Drain oil, remove wheel and its drive-shaft complete.
2) Clean area around gearbox seal.
3) Remove circlip on the now exposed gearbox flange and using a puller remove flange.
4) Remove the now exposed dirt shield which is attached to side of gearbox. (These are large philip screws so use correct driver or you could 'round' them)
5) Now very carefully drill into the drive-shaft git seal at two opposite places so you can screw in 2 self-tapping screws. ONLY drill into the metal part of seal and do it gently so you don't go through with a jerk and damage seal housing behind.
6) With the 2 screws firmly in place use a slide hammer with appropiate claw to pull the seal out evenly, alternating between the screws.
7) With everything cleaned again fit seal using a socket of almost the same diameter as seal and tap it in with a poly hammer until it bottoms out.
Refit the dirt shield and as a good idea put a bead of sealant between it and the gearbox and anti-seize on the screw threads.
9) Flange on, double check security of circlip and refit drive-shaft. I put anti-seize grease on drive-shaft bolt threads so I know I'll be able to remove again if neccessary but I'll leave that to your discretion!
10) Wheel on, lower and refill with fresh SAE 80 approx 3.5 litres.
11) Short drive and check for leaks at seal AND filler/drain plugs.
12) Hot bath and cold beer.
Only part I needed for one side was V0291 301 189 Seal @ £13.04 + VAT from VW.
Cheers - Brookie
