They're not. Different lengths and diameters.
Similar trim - same screw.
James,
here are the part numbers for the screws and their dimensions.
#86: & # 87: lens head (oval) screw DIN 7983 (007983 003335)
3.9 x 9.5 mm blunt end, Zinc (or Cadmium) plated
#115 & #116 & #117: lens head (oval) screw DIN 7983 (007983 002203)
2.9 x 9.5mm, chrome plated
#105 & #106 flat head Phillips screw DIN 7982 (007982 002219)
2.9 x 6.5 mm, Zinc (or Cadmium) plated
#88: spacer, p/n 113 727 00 17 (dimensions approximately: 5.5 mm long - OD 6.0 mm - ID 4.8 mm)
I hope you didn't loose the spacers (#88) that protect the rubber seal - they are costly EUR 3.59 each.
Let me know if you need them. I have a piece of tubing with the same dimensions that I can mail you and you can cut it up and use.
I have used the copper wire trick and it works perfect - thanks Joe!