biggurs

I have run flat tyre package on my 2004 e60 which means I dont have a spare or a jack in my boot (trunk)
What I want to know is how do i jack up my car using my trolley jack because i dont have the bmw jack (i want to paint my calipers.... probably get stuck doing that too but thats only if i succeed in jacking the car up first!!!!!)
I have read somewhere on this forum about someone using wooden blocks cut to size so it fits into the jack points but is that really necessary?
There may be other jack points towards the centre of the undercarriage but I probably wont find them. Some people say they use the differential as a jack point and some definately say NOT to use the diff.
Its getting a bit confusing and to be perfectly honest I cant seem to be able to do anything without running into problems. Cant seem to be able to takeof the kidney grill which is supposed to be a piece of piss.
I want to paint the calipers but i dont want to use a trolley jack in the incorrect place and cause damage.

biggurs

This somehow is a duplicate of another identical thread I have started and all replies and answers are on that one.
Thanks for looking