What size cell?
The regular L2 can take a 17670 Li-Ion and an 18650 body version is available (that is what both of mine are).
If you are talking about a short body, then yes, you can get a small body that takes a 16340 Li-Ion. It's referred to as the L2M.
It will not work with a primary CR123A cell as the P60 drop-in requries a minimum 3.7V to operate (CR123A primary is 3.0V)