36" is a lot of bar to ask of a 372XP!
D009 is the correct mount for your saw.
D025 (Stihl 3003) is the Stihl mount & can be used on your husky with an adapter but you will have reduced chain adjustment. Upside to the Stihl mount is interchangeability & possibly easier re-sale.
3/8 & .375 are the same pitch.
The gauge (.050, .058, .063) needs to match your chain. Some say .063 oils better (good for milling). Upside of running a smaller gauge is you can move up to a larger guage chain as the bar groove wears.
If you are set on a 36" bar I wouldn't consider milling with anything other than skip tooth or a Granberg type chain (you can grind Granberg yourself from regular chain but its time consuming)
I'd look at the chain options you have available to you & buy a bar accordingly.
If you can find one that takes 116DL then you will end up with an even cutter count which is always nice