What's interchangeable between 110's and 125M's

[200X FT]

Hello. I saved an 85 125m last weekend from being parted out and scrapped. The guy was going to sell the engine, keep the rear end for a go kart, and junk the rest. Now the interchangeability part, I need a seat/rear fender for the 125, but I have a Maier 110 fender and seat I thought would fit. I THOUGHT it would fit, but it just don't seem meet at the tank correctly. I'd like to know what all can interchange between the 110's and the 125M's(84-85). I have an 83 110 roller that I was going rob parts off of to get this 125 all together, but I'd like to know what works and what doesn't. By the way, the engine fires right up with no engine noise and the only thing that's missing is the seat/fender combo, ignition switch and front brake lever. everything else is there

[jr315rn]

if u use the same tank for the 110 u will be all good

[200X FT]

so I have to use a 110 tank with the 110 fender. Ok, I thought I could get away with the 125 tank I have. I would trade it for a 110 tank on here, but it has a small hole in the left side. I know some of you guys out there have messed with both 110's and 125m's, what can swap between the two. I'd like to get this 125 moving soon, time and money are going to be limited once the race season starts here. So please, any info on what parts fit what for these would be appreciated.