Hey, here are the parts; that I found, looking on:
https://parts.vw.com/
You would need to confirm; by having your vw dealer, look up the parts with your vin #; to make sure, you get the right parts (e.g. manual trans, auto trans, etc). From what I can tell; the ignition switch, comes preinstalled with the ignition lock housing and so, you wouldn't need to buy that seperately.
The reason, I say to "replace everything"; is the amount of time and labor, to get in there, is somewhat involved, you have to remove the airbag, tear the column apart and all the parts are probably worn anyway. Do it all at once and everything would be new and hopefully; this would provide you with trouble free use of the key, for the foreseeable future. Do it once and do it right; don't set yourself up for failure or create a situation, where you leave the possibility, that you need to do a "do over", just because you overlooked, replacing one of the parts. You will save yourself time, effort, brain damage and money, in the long run.
Three parts:
https://parts.vw.com/a/Volkswagen_2...rtibleATSE/_53901_5985272/SHROUD--SWITCHES--LEVERS-STEERING-COLUMN/9211270.html
#6, #7, #8: in the exploded view: Ignition Lock Housing, ignition switch and Ignition Lock Cylinder.
Ignition assy. Ignition lock. Ignition Lock Housing. Lock housing. Steering Column Lock. Steering lock.
auto trans; CONVERTIBLE,; CONVERTIBLE, auto trans.
4B0905851P
$158.10
Ignition Starter Switch. Ignition switch.
CONVERTIBLE,. Part included with Steering lock..
4B0905849
$73.43
Cylinder switch. Ignition cyl. Ignition Lock Assembly. Ignition Lock Cylinder. Ignition Lock Cylinder Set. Lock cyl assy. Lock cylinder.
coded; CONVERTIBLE, coded.
107905855CF
$99.00