Found lots of 17mm head bolts (still 14mm x 1.5 thread, and the longer length). Haven't found spare 19mm headed bolts (yet).
You can buy the black plastic lug nut covers for the 17mm bolts as well, you just have to ask for the ones that fit Audi 4000 quattro / Coupe GT / 5000.
Let me know if I should put these in my car for the next time we meet.
-Dave