17s would go but the biggest problem is clearance for the brembos
Cant help much but you may have to be the guinea pig, see if spacers are required.
I cant even think of anyboy running 17s on a LCR
 
i've got a fr+ with the baby 17inch cupra R alloys. behind them sit porsche 4pots and 330mm discs, all with no spacers! (not the exact same brembos but gives you an idea)