Yeah, I know what you mean.  I bought the chrome looking "John Deere" emblem for the side of my JD 4020, and one of the little studs was in the wrong place.  That was quite a mess.   I should have just sent it back, but my "oh, I can fix this" attitude got the best of me, and I just had to start fiddling with it....

What I've had really good luck with is bearing, chains, seed tubes, gathering belts, knives, chopper parts, etc.

One more thing: just recently I bought, from Shoup, a monitor caddy for my JD 8410.  It was about 1/2 price of JD, and looked pretty much identical...I say "pretty much" because Shoup's had a little tray (very nice btw) made on it that JD's did not have...

I wish there were more companies like Shoup!!