Will another early frame (1911-13) work with a 1910 T? I know the running board brackets on the 09/10 had thicker areas where the bolts went through, and there may be other small differences but other than that are they similar? I'm more concerned with the holes on the back of the frame that are for the rear fender irons; I believe only 1909/10 had the irons directly bolted to the rear of the frame. Are there holes at the rear of other early frames (1911-13) to attach these irons? I know ideally finding an original 1910 frame is what I should be aiming for, but I'm thinking they are pretty scarce and if another early frame pops up, maybe I should go for it. I'm not looking for Stynoski points here either, but the current frame on my '10 has been crudely cobbled together with much later frame parts (there is a script Ford stamped on the front cross-member). Any input would be, as always, appreciated!

Hello Bill:
The 10 rear fenders mount via the same mounting brackets that the rear body is fastened to. There are no dedicated rear fender related holes in any 09-14 frame.
Regards,
Scott

Mark Hardman posted a study about frames in 2013 - he has six different schematic drawings for frames from late 1908 production until mid 1913 when the rear crossmember got longer.
It isn't easy to read the differences from his schematic drawings until you have a frame and a metric tape measure in hand

Note: he has checked Canadian produced frames in Australia, so there may be differences from US production.
http://www.mtfca.com/discus/messages/331880/356544.html?1366444998

Post some pictures of the areas of concern on the frame you have. Perhaps they can be remedied.

So if I'm hearing right, a 1911-13 frame would work with a 1910 T?

Yes, they will work. If you read the notes at the bottom of Mark's schematic drawings, you can see what minor hole changes there were over those years.

Running board irons are different on the 1909-10 frames. Note the bend just passed the flat area bends up much sooner then the 1911.