never knew auto leads did protection, ive seen some cheap and nasty plastic grilles on some cheap and nasty oldschool paper cone subs but not anything recently except those dodgy bar things. good to know some people at least make some protection, even if few people appear to use it!
if all else fails overseer you could consider mounting the sub back to front, shouldnt stick out that much from the depth you say and protection then would not be much of an issue.
