TBH I've always gone with the specific JD belt for my D110, and I've always got a spare belt on hand 'just in case'.Get the JD belt..
Learned years ago with my '68 Wheel Horse mower that all belts are not created equal. Kept trying to get a replacement belt to work, when it turned out WH had special belts made for them to their own specs. And the WH belts worked.
I'm a retired JD engineer... my name is on a lot of belt drawings. Sorry, but creating 'special', non-standard parts (whatever that is) is not a motivation.... lol.JD is infamous for 'special' parts dimensions. Their belts and pulleys for example often use non standard dimensions and angles. Motivation is to drive you to their branded products telling you that others are not compatible and won't work, at least not as well.
Your claim that the belts and pulleys are not specific to JD doesn't pass the smell test.I'm a retired JD engineer... my name is on a lot of belt drawings. Sorry, but creating 'special', non-standard parts (whatever that is) is not a motivation.... lol.
Deere has very high life goals for it's components... especially belt drives. So first, the drive is modeled on CAD and hand calculations are made to determine what loads/speeds the drive will see. In CAD you can move sheaves around to be certain that the belt clears other components. It's not important at all that any of the components match "standard" components. It IS important to try and use components that 1) are already in the Deere system (with a proven track record), 2) already stocked on the assembly line (avoids assembly mistakes), and 3) lowers costs by increasing volumes on existing JD parts.
For belts, I always looked in the system to see if a similar part could be used. Maybe a sheave(s) could be shifted to get an existing JD belt to work. Great! If not, you are working with an application engineer (from the belt supplier) that will review the design and make exactly what you need for that application: belt section, raw edge or wrap, cord construction, length, etc.
Make sense why the belts/sheaves hanging in Tractor Supply are not a consideration?
No. Not at all. What it does say is that JD wants customers to buy JD parts and ONLY JD parts. This gets into the while 'right to repair' issue. I'm not intersted in feeding JD's coffers. I'm interested in getting the best value for my money. I'll buy generic parts.Make sense why the belts/sheaves hanging in Tractor Supply are not a consideration?