Thanks to you Tooki. In my searching, I used "automotive" and "connector" a lot, but not "motorcyle" or "Japanese", which were the magic words. Nice to know the connector type (MTW). Unfortunately in the electric parts world, MTW means machine tool wire, which complicates additional searching. JST makes a somewhat similar (but incompatible) MWT connector, which some websites (like Mouser) confuse with MTW. They are sometimes called 110 or .110 connectors because 2.8 mm equals 0.11 inch. However, there are lots of other connectors that use 2.8 mm contacts.
The Sumitomo Wiring Systems pdf wasn't that useful. I don't read Japanese and wanted to know if there was any electrical data other than wire sizes, which I was able to determine from the pdf. An additional complication is that the pdf is mostly a collection of bitmaps. Google was a complete loss for ocr and translation. Convertio and onlinedoctranslator did a nice job though. No additional electrical info was in the pdf, but I did find out that Sumitomo Wiring Systems started as Tokai Electric Cable. I'm pretty sure the diamond TD logo on the first page of the PDF stands for Tokai Denki-no (Tokai Electric).
Apparently, the only name-brand manufacturer of the connectors is Sumitomo. However, they are made by many Chinese companies. Apparently, they are very popular based on the number of sellers on eBay, Alibaba and elsewhere. I find them very useful for 24 VAC at 0.5 A or less. I use them in applications powering solenoid valves and relay/contactor coils. For single connections, 2.8 mm quick-connect lugs for various wire sizes are readily available. I don't use them at mains voltages.
Mike in California