Sorry, I am a little late to the discussion. I also have a 50C (I assume that is the 50" deck you are referring to) and have just put on a set of Oregon Gator blades, I bought a couple of years ago. They kind of got lost in the shuffle of a move. They are Oregon Part# 90-656. They are the original style G3 blades that are no longer on the Oregon website, but there are a number of places online that sell them. Watch the price though. There are some people selling them for ridiculous prices. Most reasonable places have them for about $25-$30 each plus tax and shipping. Agri-Supply has them, but only in their stores, not available from Mail-Order from them. I'll leave the link for them, in case there is a store in your area, or perhaps, they can get them sent to you from a store. Their website is: 17-3/16Good Morning all. Been reading the posts on blades. Last year I bought a set of factory blades for my 50" deck. At $75 each. The lift is nearly gone and the front cutting edge needed a bad sharpening. The blades are suppose to be hardened, to hold up. My lawn has a lot of sand under it which causes the problem. I read with interest of the variety of blades available. I have searched the internet for blades but generally come up empty. If you have a good site with good blades, I would be most appreciative to take a look.
I haven't tried them yet, but they seem very heavy-duty.
Hope that helps.