Tried to order one from Nengun and was told that D-Sport doesn't make them anymore. If anyone has one to sell, I would be a keen buyer. Otherwise if someone owns one and can give me exact measurements, I could have an engineer make a similar one for me. Thanks, Joy.
Oops - my mistake. I had a quick check online in Japan using the actual part number 12601-B080 but it appears sold out everywhere. Part number has been struck out of the D-Sport catalogue. Used sample might come up on Yahoo Japan...
Found one on Yahoo auctions Japan, cost 26,500 yen, Jesse Streeter to ship. Of note this is 10,000 yen more than they cost new. This is what happens when a part goes out of production.