Normal
the longer bolts are needed because when you 'raise' the bonnet by a say, 10mm, the bolts maybe too short for the job.so when you put in 10mm of washers, you'll very most likely need a bolt(s) that's 10mm longer.not too long of course, else the extra length of the bolt cannot tighten all the way because you may screw it till you touch the bonnet..
the longer bolts are needed because when you 'raise' the bonnet by a say, 10mm, the bolts maybe too short for the job.
so when you put in 10mm of washers, you'll very most likely need a bolt(s) that's 10mm longer.
not too long of course, else the extra length of the bolt cannot tighten all the way because you may screw it till you touch the bonnet..