The OO14 RS sounds like how the numbers are called out on the ones at Fleet Farm. I think they sell Weise tillage parts-
The OO designates Oliver, 14 being 14", and RS being Rock Share. Rockshares wear longer, and hold up better to rocks. Whether that makes them worth the 2x the cost over a normal one, I don't know. We always have run rockshares on our plows, but with 16" ones now being $45 each, I went with the normal ones for $20/each.
As for 3 hole/4 hole, put a bolt in the extra hole just to plug it.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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