I  just bought a motor guide FW54 lb thrust trolling motor and am wondering when i mount it will the holes line up to my previous trolling motor which was a FW40 lb thrust motor guide?

I suggest you take the new motor and place it on your boat to see if the holes match up.  Use a piece of stiff wire.

Yeah im going to see if they match up i just wanted to see if anybody had ever done something like this before i started. Have been working so much havent had see if they match up.

I switched from a FW model to a Digital Tour and used the same holes.

You could just leave the mount that you have on and just switch the rest of it.

thats what i was thinking. I was hoping i didnt have to buy that motor guide bracket for a hundred dollars b/c i didint want to have to drill any more holes. Thank you for your suggestion.

It should fit.  I switched from Motorguide to a Minn Kota and used the same holes.