I need a RAM mount, but all of the ones I see do not have my x125 listed as one that will fit. Any help please.

Does it have the usual rectangle Lowrance base?  If so, the standard Lowrance RAM base will work.

I am looking in a Donovan marine book (marine wholesale) as we speak, and I see a Lowrance/Eagle RAM mount but my x125 is not listed. I see a gimbal bracket that fits it, are you saying the bracket it is already on will fit on the RAM? Sorry for my ignorance I have never really messed with it too much. It was on the boat when i bought it.

The RAM B-111 or 111U should work.  They both feature the same plate size, which I think is standard with the Lowrance units.  The B-111 is a light-duty mount, the 111U a medium-duty.

I have both of those rams and have had 3 different Lows on them and the brackets from all have fit them just fine.

I have both of those rams and have had 3 different Lows on them and the brackets from all have fit them just fine.

X2

Your Gimble mount has holes in the bottom.  These holes match up to the rectangle on the Ram Mount.  Just screw em in, tighten them down and go fishing.  

Even if the holes don't match exactly you'll be alright as long as they are both close to the same rectangle.  I had a Lowrance not match up once but all I did was drill a couple holes in it and it was fine.  All the other Lowrances I have had fit just fine though.  I can't remember which I had that didn't, but I know it wasn't yours.