Weber cockpit seat side plastic trim.  Virtually impossible to find.  The airlines stopped using these long ago because they didn't want the expense of maintaining them...so, poof, fini.  Set of 2, $95...if you buy a set of seats the cost will be $50 for a pair of these, enough for one seat.

Weber Cockpit Seat Side Plastic Trim (Set of 2)

$95.00Price