I swapped out the stock straight stems on my 19 ISB for a pair of these:
www.cyclegear.com
The stock size is the smaller diameter, but they were unavailable in black. Rims are easily drilled out to 7/16s, which fits the 11.3mm size perfectly. Takes all of 5 minutes to step drill up and debur to get stems that make pressure checks 10x easier.
Btw, installed mich comm 3 cruisers, which so far are outstanding tires.
Mike

BikeMaster 90 Degree Valve Stems - Cycle Gear
Note: The red option will be lighter than pictured and is almost pink in color. Shop Cycle Gear for our 30-day best price guarantee & 90-day hassle free returns.

The stock size is the smaller diameter, but they were unavailable in black. Rims are easily drilled out to 7/16s, which fits the 11.3mm size perfectly. Takes all of 5 minutes to step drill up and debur to get stems that make pressure checks 10x easier.
Btw, installed mich comm 3 cruisers, which so far are outstanding tires.
Mike