[C320-list] Tools to Rebed Stanchions

[Dave Hupe]

There have been several very good guides I've read from other owners (particularly Warren Updike and Herb Creech) about how to go about rebedding stanchions. Due to looseness and leaks, I'm faced with probably rebedding both of my gate stanchions (the ones on the port and starboard sides of the cockpit with double legs) . 
In order to be able to reach up from underneath and turn the large nuts under the stanchions, "crow foot"  wrenches have been recommended that can be used at 90 degree angles off of ratchet extensions from down in the cabin along the outer wall sides.  Warren recommended these inexpensive crow foot wrenches from Harbor Freight for the job  https://www.harborfreight.com/search?q=crow%20foot%20wrench%20set   
Alternatively, other owners have removed the top teak covers at the cabin sides and then cut openings through the fiberglass wiring channels beneath .  This allowed them to reach with open box wrenches from the sides through these openings directly at the nuts.  Reportedly cutting into the wiring channels does not compromise the structural integrity.  You only need to be careful about wiring running along the channels.  The teak will cover these holes (if not made too large) after completing the rebedding.
My question ...... in order to buy the correct set of tools, can anyone tell me the size of the nuts (particularly the largest on the main support)?  Are they SAE or metric?  
Any and all other suggestions would be appreciated. Thanks !
Dave Hupe
1994 C320 (#32) "Mayan Sun"
Holland, MI