I have a 2008 1.9L VW Golf TDI Edition. Based on this car sale add I'm fairly sure it's an MK5, but it would be nice to have some kind of reliable resource as I'm going to start buying parts online and I don't want to stuff it up:
https://www.redbook.com.au/cars/details/2008-volkswagen-golf-edition-v-auto-my08/SPOT-ITM-286500/
I can't seem to find any information on how to tell them apart...