Investigated parts and compared to your pictures. I need to order two (2) 2410 and two (2) 2830. Will probably need more as time goes on.
From the pictures I see on your website it appears to be a series 390 but I need your direction to confirm this. There are no other markings except "2410 #" and "2830 #" on the parts.
I attached pictures of the old parts. Some plastic has been destroyed over time. The old bottom shoe is 1" tall, 1/2" wide, and 1 1/8" deep with NO WINGS (15-001 ???). The old top shoe (based on your pictures for measuring) is 1 1/4" tall 1/2" wide, and 1/2" deep with NO WINGS (19-002 ????).
Is a series 390 the best guess or do you think it is a different series ????