Dear The Warden:

They are about $43 a pair ($6 S/H). I did valve adjustments on a W116 300SD, a W126 300SD and a W123 240D using regular
14 mm open end wrenches. It took me from 30 minutes to 45 minutes (all valves were tight)

I do think that using the bent wrenches will cut the time in half. I may consider buying these bent wrenches in the future.

Eric