Mine is a D130, not much different from yours.I think I have the same John Deere Mower (LA105?). I have always struggled with the oil change. I usually slide a thin foil pan under the mower, with the front tires turned out of the way, and I usually catch most of the oil, but it's a pain. I like the flexible funnel, and will definitely give it a try.
The ones I am familiar with are essentially a thick and very flexible aluminum sheet that is overcoated with a silicone, rubber, or nitrile type of coating. - DaveI think my wife got it on Amazon. I think they really are call flexible funnels. They pretty much stay the shape you fold them into. Have no idea what they are made from.
Yes, that’s exactly the one I have.