I bought G22 OEM parts to install it in a OEM+ modification style.
There are several posts in g20 forum
https://g20.bimmerpost.com/forums/sh....php?t=1810482
For sure it's one of the cheapest options, both strut bar, the front bar (the g20 and g42's one doesn't have threads for bolts) and all the bolts cost me about 200$ (180€).