Blue point used to do them, just not seen them in ages and in the past when i did work on cars I found them really useful, especially for opening up grommet holes to pass cables through them, someone must still do them or have a set hanging around, don't care what the cost is, just really could do with a set now...
They look a little bit on the industrial side, was looking for something a bit on the smaller side, the ones that I can remember were like a pair of side cutters, may try and get a set of these industrial looking ones though, they may just do the job...