I'd like to see a Lee collet sizing die for the 7.62X54R cartridge as a regular production item, rather than a custom order item. I think Lee would sell a bunch of them.
On a slightly different note, I'd like to see someone offer up new production #3 bolt heads for the No. 4 Lee Enfield rifle, at a price that was significantly less than the cost of the entire rifle. In other words, for $50, tops.