I've had a few of these hydro's apart. Some have had 2 some one. Who knows why some are that way. Two would make sense, but when I was putting that one the other day back together I didn't give it any thought, nor did I have another pin, so it got one. Two is not a bad thing. I think the shaft fits the swashplate tight enough that I don't really think that putting two in the far side would matter, but who knows. Next time you do one, give it a shot and let us know in 5 or 6 or 10 years if it leaks, LOL.
As far as getting parts at Deere, I don't think anyone here said anything about it. Same parts, different bag, different price. I'm fine with it.