The bows for the M101 and M37 are not the same. The wood has the same cross sectional area, but the lengths off all the components are different. The corners are also different, the ones for the M37 have holes in them that you can pass a rope or strap through and have the bolts running parallel to the centerline of the truck, the ones for the M101 have no rope/strap holes and have the bolts running perpendicular to the centerline of the truck. You can use M101 corners on a M37, but you have to use the M35 style tarp roll up straps instead of the M37 style, and you can't run the front or rear curtain rope through the bracket (a small deal in both cases).
I have dimensions for both types of bows on my website at:
I took some photos yesterday in hopes that things would be clearer, but I am still having software problems so the photos are not on my bedwood page on my site. The photos are "stockpiled on one of my servers.
Photos of the M37 bows/corners are:
http://www.ipass.net/cgarbee/m37bow1.jpg
http://www.ipass.net/cgarbee/m37bow2.jpg
http://www.ipass.net/cgarbee/m37bow3.jpg
http://www.ipass.net/cgarbee/m37bow4.jpg
http://www.ipass.net/cgarbee/m37bow5.jpg
http://www.ipass.net/cgarbee/m37bow6.jpg
http://www.ipass.net/cgarbee/m37bow7.jpg
Photo 4 is likely the best one to show the corner on a M37 if you don't feel like looking at all the M37 ones.
Photos of the M101 bows/corners are:
http://www.ipass.net/cgarbee/m101bow1.jpg
http://www.ipass.net/cgarbee/m101bow2.jpg
http://www.ipass.net/cgarbee/m101bow3.jpg
http://www.ipass.net/cgarbee/m101bow4.jpg
Photo 1 is likely the best one to show the corner on a M101 if you don't feel like looking at all the M101 ones.
The dimensions for all the wood pieces is looked on my site at:
http://www.garbee.net/~cabell/bedwood.htm
I have yet to measure and photograph the bows on any of my M35's... But I will have to replace a couple of pieces of wood in the near future on one of them as I have a couple of splintered ones on the rear bow of a truck I just got into the yard, and the troop seats on another are a tad rough...
I'll post this over on the M37 section as well...
Good luck.
PS: Use of the M101 corners won't particularly hurt the canvas on the M37 as long as you use round head screws like the ones that you are supposed to use on the M101 to mount the wood to the corners... All you have is a tad more metal rubbing on the canvas and you don't want any sharp corners...