Eagtac d25a and d3a mod

I absolutely love these two flashlights but changing the emitter and driver would make them perfect. I’m still new to modding and I’m trying to get the hang of it. The d25a is a 219b and the d3a is x-pl hi and I’d really like to put a W1 into the d25a and 519a in the d3a. Id also like to put a new driver in them. I read that a mtn15 will fit. What all would I have to do to make this possible?

if you are not the same person that asked the same question on Reddit (with a different user name)

I suggest you read this thread