Just to let you know that I’ve used the drop kit on a few jobs recently, and has worked well on all of them.  I havent come across a top vent that it wont fit so seems to cover all of the smaller ones. A couple of the jobs had resticted internal and no external access, so without the kit would not have been able to repair them. I’ll put a post on to the Dawta and ICL forums recommending the Top Hung with drop kit.