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215/60r 16, 225/50r16 or 225/55r16 will all be ok. 215/60r16 will be the cheapest option.
Tried 225/55X16 on my VC (same strut) and they hit the spring base....I suspect the 215/60X16 will do the same, even though I haven't tried
These were tried with VXSS rims (currently fitted to the car) and 16X8 CSA Prowlers
That's weird, can't explain why your having issues with your vc but I've been in the tyre industry 12 years now & never had an issue fitting those size tyres on 1st, 2nd or 3rd gen commodores including my own Vk with 16x8 hdt momos
To the original poster, I recommend you take your wheels to your local tyre joint & ask for their advice.
How much clearance do you have with the fender?
Seems like you need wheels with less offset.
Pick up a set of factory BMW wheels off Gumtree.