I have found some retainer rings for parking light lense on my 26 Buick. I found them at Lowe's, called reducer washer in electrical dept. 1 1/2"- 1", Neer brand at a cost of 62 cents for 2. Home Depot also has them under another brand name. I kind of found them while working on installing my lawn sprinkler system. The control box had a large opening for conduit which I needed to reduce. While looking at them I matched them with the old retainer ring and were exact size. You will need two per lamp. Good Luck