Greetings to all. Been a while since I posted on here, but thought I'd pass this along...
Resurrecting a year old post, but it's exactly on the topic I intended...
By accident, I found the "real deal" original round metal internal star fasteners used for the side skirts on MKIV's. Not sure if it's ok to post a direct link to a seller, so I'll just describe one path that leads to them-
Rock Auto
Audi
2006
A4
2.0T
Engine
Engine Heat Shield Retainer / Clip
It's a 3 piece set consisting of (what we know as MKIV Jetta / Golf...)
1 round star fastener for side skirt attachment to subframe
1 belly pan screw
1 snap-in sheet metal nut (in subframe, accepts belly pan screw)
AKA Dorman 700086
The above for 0.49ea, but sold in groups of 10 so you have to commit to $5.00