This is a rubber channel material --I had to widen with a form and heat gun-- to fit the lower edge of the lamp base. I used "O" ring flexible super glue and straight edge razor to fit the corners. The glue works so well on rubber- it might as well be one piece!
 
Customers taking the "Midas Touch" off his 1972 Stutz Blackhawk. All parts repaired and re-chromed in shop.