The International Cessna^® 170 Association

My mechanic is having a heck of a time finding a part number for the flap ribs for my 170A. He is talking to Cessns, and they can't seem to be able to figure it out, eithier.

I did a search to no avail...

I guess that means they aren't going to have any.
The IPC doesn't list any, of course. It looks like the only existing are the end-ribs, which are not difficult to make.