I'm looking for some led drl p13w bulbs that will fit my 2014 forester
 

Mine is a 2.0 xe and the drl bulb sits in the same housing as the fog light, but the usual led p13w bulbs dont quite fit.

looking for anyone who has done this already

Depends what you mean by the "usual LED P13W bulbs" Pictures of what doesn't fit may help :)

Looking at the light unit the drl bulb fits at an angle so the "usual" LED bulb is probably too long and touches the lens glass.

http://clarkdh.net23.net/NTL/MY14FogDRL.PNG

LED bulbs are available in different lengths/configurations depending upon the number/type of smd's fitted.
https://i.frg.im/u5d3xaj5/p13w-selec...ustang_600.jpg

You need to find one that suits the housing