defo 5X100, off set should be 53mm i think
But to be sure, just inspect your rim carefully, it may say it on the outside, but it'll more than likely be stamped on the back of one of the spokes! my standard 7.5X18" silver wheels are 48mm offset
I beleive, the lower the offset, the more space you'll have,
Sure you could probably fit 20mm bolt on spacers with very little hassle
Dan