Do you have AWM? It will say so on the engine, it should be engraved in a tab on the engine in the front top, right of the oil cap. I just figured you did. I have a 2003 1.8T and it's AWM. ETKA only has one listed as the engine code for 4 cyl (1.8T) 03/01 - 05/05:
Regarding the part 035103245A for PCV valve that is probably wrong. VW parts says for its fitment "To Chassis/VIN 1J-1-069 999. To Chassis/VIN 8E-3-040 000. To Chassis/VIN 9M-4-042 774." And then it only lists 1998 as a compatible year. If you have like what I showed you in the photo where it branches off you'll need 06B103245 instead. ETKA confirms. I suggest you download a copy of B5.5 ETKA, see here and click on download all in the google drive and save it all to a folder. Open "1 engine, clutch.pdf", page 23. Note the Model column will say AWM (I'll assume that's your engine) and that's very important, there are other engines as well in different diagrams and you don't want the wrong parts.
See how you feel about doing it "right" after you spend $1000. These old cars are money pits, only keep em if you like driving em.Nope budget is not exceeded yet. I'd rather do it right.