Year or so ago I was at my local CC/Case-IH/International truck dealer on a parts run, PAUL R. knows who I use.... so does Charlie.
I asked the parts guy if he had an oil drain plug for the Onan in my 982, the one that was on it had a very shallow hex, maybe 1/8th inch high, plus it was recessed up in the frame and oil pan and my socket had chewed up the corners of the hex which were already chewed up when I bought the tractor 10-12 yrs ago. The parts guy laughed, "You mean an ONAN part?... HE-HE-HE...NO!" So I look up the part numbers for a B48G powered #420 and called the local off-brand dealer. Parts guy apologized for not having the parts in stock but said he'd order them and I could pick them up in 2 days. When I went and paid the $3.25 for the nylon washer and $3.17 for the new drain plug I find the new plug had a hex almost TWO inches long! I cut the hex off about an inch and it works fine.
I have a small power equipment shop about 5 miles from my house, mostly sell Stihl & ECHO hand-held equipment, but they're an authorized Kohler, ONAN, & B&S dealer too, but they don't stock ANYTHING for an engine ten years old or older. Everything would be a special order and EXPENSIVE. The little grommet for the points cover on a Kohler K-series would be almost SIX Bucks!
SO... Like STEVE B. says, many many parts for the CC's and the green & yellar tractors are ALL made by the same outside suppliers and depending on your local dealers you can get quite a few CC repair parts from your local JD dealer. Sometimes the JD parts are cheaper, sometimes the IH/CC parts are cheaper, depends on your dealers. If your local CC dealer is a Case/IH/NH dealer IH still has the service parts for CC's that are common with the CUB Farmall and other equipment that use similar parts. Last pair of CC rear axle carrier outer seals I bought the invoice said they were "Corn Head Gearbox seals", and since every corn head has two gearboxes for each row and each gearbox has two or three seals IH buys many many more of them than MTD, and the price reflects that volume.
I'm like Steve too, my JD-cloned weights are almost twice as heavy as CC weights, the hardware I bought, four 1/2" x 6" carriage bolts cost more than I paid for the weights, and they look fine IH 935 White.
One thing about those off-topic parts is they are much more confusing, they used 3/4", 1" and 25 mm spindles, and without a serial number there seems to be problems getting the correct parts. One thing my buddy who has four #317's always rubs in is the fact he can rebuild mower deck spindles for about $16 each, and I spent $170 on ONE waterpump bearing & housing for my 50C deck a year or two ago. I really didn't need the new Woodruff key but it was only a Dollar. The top housing half was the REAL painful part, it fits in the palm of your hand and was almost $60.
SCOTT T. - I know parts prices have really gone up the last couple years. Not sure what the CC/MTD frt wheel bearings would have cost six years ago but I replaced all four on the #70 about 1-1/2 yrs ago, $16 EACH, so $64 plus tax total! I've been the way of the cheap hardware store bearings before too, I'd rather pay a little more for something that will last more than 2-3 years.