Supposedly there are. There are a few threads on it a couple of pages back where ppl DIY mod a vertical grip, I'm sure u can find it using the search function.
No one will do it for you cos the cost of the mould can get u a full frame Nikon and Canon plus some extra cash...
Just use the 5D as it is... or buy a BP-400 vertical grip meant for the A1/A2 and modify it.... how to modify is posted somewhere on this forum... do a search for "5D vertical grip"...