The 7109 is sort of obsolete in the industrial world. International Harvester engines used the 7109 pilot bearing as well.
If you are rebuilding your engine, you may want the hole in the crank machined deeper for the 2 mm wider 6202 bearing. Some have said it fits without further machining. You can get it with 2 metal shields or 2 rubber seals. I don't know which would work better.
If you seem to be eating pilot bearings (or tranny input bearings), check your bell housing alignment.
In my experience back in the day after about 40,000-50,000 miles of street driving, the clutch and the pilot bearing needed to be changed. More often if you drove like a maniac. It was a regular service item.
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