Channel Balance 29" long 28E stamp

A quick learner from Orlando, FL says:
This is a 29" balance x 1/2" wide, stamped 28E, top and bottom pictures are attached, can you please help me identify the correct part? I thought I found the right but the stamps don't match...thanks!

A customer submitted photo of channel balance attachments.
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Paul from SWISCO responded:
Thanks for posting! Please take a look at our S380-29 channel balance with a 2850 stamp option. Does this match your hardware? Do the dimensions of the two plastic attachments match your own?
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