336/337 Flap Roller Assembly Question

[DavidC]

Just removed all flaps during an extensive first annual on my 336. We found the flap rollers were all in rough shape. Flap tracks are fortunately in good shape.

We found that all of the upper outboard rollers were the narrow roller (P/N 0523920) with proper spacers, but the inboard upper rollers on all four flaps were the wide roller (P/N 0523921) without spacers.

Both the 336 and 337 parts catalogs show that all upper rollers (inboard and outboard) on all flaps are the narrow roller with spacers.

My Question is: Is anyone aware of a service letter or bulletin that recommends this change - or is it just wrong and should be configured as shown in the IPC?

I have been unable to find any documents for the 336/337 that indicate this roller change is correct.