I know when the TI 15 came out you could by the basic version and it came in a SYS-3 so you could pair it with a C or T 15 in one systainer. I was wondering if there were any basic versions of the 18v drills that come in a SYS-3 to pair with another drill or if the TI 15 insert would accommodate the 18v drills. I would like to pair the PDC with a C 18.