VINCENT - I was on Cedar Rapids Tire's website this AM and they still list the 23-8.50 X 12 2-ply 23 Deg. Firestones for $78.?? each. Not sure if they have any but with the rumors that Firestone is out and isn't making anymore I was surprised to see them.
I used to know ALL the National OEM sales managers for GY, Firestone, & BFG back when I worked at FARMALL. Problem is that was about 30 yrs ago and They're ALL gone.
I don't think that Deare on the rock picker is a 4010. Dad had one, a diesel w/wide frt end. Nice enough tractor to run, just wasn't a real big HORSE, Even with the 4020 Kit in it, it still would only pull most of Our 4-bottom sized equip. maybe 1 MPH faster than the old Farmall 450-G the 4010 replaced. And like most 4010's We fixed the 24V electrical system, the rear draft link sensing seals, replaced the head gasket, water pump, finally a clutch, couple sets of batteries. We couldn't even use it for most PTO jobs because the four 3/8" capscrews that held the rear PTO stubshaft on would work loose. Only normal problem We didn't have to fix was the hyd. pump drive off the frt of the crankshaft.
Heritage Iron is written by Sherry Schaefer who also writes the Oliver Equip. magazine "OLIVER HERITAGE". Website is "heritageiron.com" or call 866-418-5548. It's got ALL colors of iron and all types of equipment. First issue had a pedal tractor article, and another good article on BIG pull-type combines. And every magazine has had an article about historical houses You can tour that were built by some of the early pioneers of the farm equipment business. There's a couple houses just down I-90 in Rockford, IL. Wife & I have to visit some weekend! They were the I-H connection.