Kraig, Harry: I wondered if the flat bar was original, I guess not, eh? The next question is how the axle channel is secured to the flat bar, it would have to be welded, wouldn't it? I'll have to take a look at the bottom side in the next few days.
Harry: Do you think simply stick welding the cracks in the channel and discarding the flat bar is going to be sufficient for standard use, plowing, mowing, etc.? If the repair is a good one, perhaps I'll just leave well enough alone.
Thanks everyone for the clarification on the seat. Since I saw 124/125s depicted with the foam rubber seat and the 102 shown with the hard rubber, I thought the hard rubber was "correct" for the 122, I didn't realize there were different seats specified for different models within the same series, except for the low-tunnel 70/71/72 etc. Once more the Forum has set me straight. Thanks guys.
Edit: Harry, I would still like to see a closeup of a known-to-be original 102 seat install as I think mine was an after-market selection. From the side shots of 102s I've seen, it looks like the "platform" was a bit more raised than mine and painted yellow, not black. I haven't seen any spring-mounted hard rubber seats, so, with Kraig, I find its placement on a 72 "unusual."