[R-390] Metal strips on inside of 390A's side panels?

[Tim Shoppa]

On the inside of a R-390A's side panels, there are these aluminum
strips above and below the main deck. They're like 3/64" thick and
8" or 10" long and 1/2" or so wide. (Actually the left ones seem
to be different than the right ones). They seem to be glued on
(they've fallen off in a couple of places on my yellow striper.)

What are these for? The main deck plate is attached by seven
screws on the left side and 5 screws on the right side, so clearly they
aren't there for locating the main deck plate. The modules seem to be
very licely located onto the main deck plate by the green screws.

Maybe the side strips help locate a module when access is poor or the
whole rig is on its side or something?

Any insight for a newbie like me?

Tim.