Dennis,
I just got back from my sister's place for Easter, in San Luis Obispo, you asked about the Windvest Item numbers. According to the Invoice that accompanied the Windvest here is the list.
Item number / Description for the Triumph America.
60-5000 Standard 14" - Clear
20-1045C Front Load Bar
40-1045C Front Load Clamp Kit
50-1046C Mini Extention Kit
50-1045C Extension Kit
And the reason I picked the 14" shield is that I'm only 5'7" in height which is perfect for just seeing over it.
Had a great Easter.

Robert