Source for Finals for the Yaesu Mark V (Non Field):

Hi Doug, I got them from
Advanced Semiconductor Inc
7525 Ethel Ave
North Hollywood
CA 91605
Phone: 818-982-1200
Fax: 808-765-3004
Very quick service (got them to the UK within 1 week of order)
Very reasonable price compared with Yaesu (who couldn't supply for 2 months!)
Guy in Sales was very helpful.... I had to order 3 when I needed 2 but still worked out cheaper than Yaesu (by a lot)