Not the sort of thing you want to be cutting corners on really. Play it safe I'd say and get longer bolts.
 
I've got a set of 20mm spacers with bolts that don't fit my car if anyone's Intrested
 
Rather than using extended bolts where they just pass through the spacer into the wheel hub the hubcentric ones bolt to the wheel hub, then you bolt the wheel to the spacer with your standard wheel nuts.
I don't think they go down to 5mm though, most people opt for 10-15mm as standard usually.

Hubcentric look like this...

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