Nice spot, thank you.
Now this is confusing, according to
BAM and my service manual, the XR Upper only comes with B1, B3 & Sportsmaster lowers and a 16/19 ratio. They don't do a Bravo 2 XR.
ETA - yeah, just been on the mercury direct and it doesn't list an XR drive with a B2 Gear Housing at all. Odd.
Anyway - I need the 16/19 XR upper with the straight cut gears