Yip they are brembos m8,I just got mine last night and just tryed them on my car[:'(] my wheels done clear them,so i have a choice new wheels or ones like you have on your car already?
Nothing wrong with second hand m8 as i work on cars doing brakes everyday as long as they are in good nick and working.But always best to find out why they have been removed as i did and it was to put ap's on.
I would say go for 215/35/18 m8 as all the classics i have done run these,and they dont cause any probs.Even with you having 8x18 they will be fine.I change tyres every day and if i go for 18's i will be running these hope this helps.
Jim