Clutch issues

So my 08 TE510's clutch master cylinder started leaking really bad on the trail last weekend. I had to put some of the brake fluid in my reservoir to make it back to the truck.
Well next day, I took everything apart to get all the brake fluid and inspect the damage. George said that I will need to rebuild the master cylinder. Cool, so I thought. Turns out that there is nice quarter inch jagged gouge were the seal rides along. So now I need a new master cylinder. So I keep removing down to the slave cylinder. Now I look at it and the snap ring is sticking half way out of its groove. Look closer and half the ears that hold the snap ring are broke off.

Now what the fudge has caused this breakage on the slave cylinder?

Question #2. Should I get a stock replacement, or should I get the one from Zip tie? Hmmmmmm!http://www.cafehusky.com/forums/images/smilies/banghead.gif