Jt20,
Let's make sure you are using the right 1985 W123 diagram... for Federal car:
http://www.peterschmidtransmission.com/vacuum/1977_1985/617_95/1984_1985.jpg
or for California car:
http://www.peterschmidtransmission.com/vacuum/1977_1985/617_95/1985_cal.jpg
for there is a considerable difference... and I hope you do NOT have a California car!!

As to having the precise color/size of orifice shown for your car, I'm inclined to not worry too much and IF you purchase any of these plastic orifices, concentrate on obtaining the small sizes: Here are the orifice color/sizes/pn(s) I have posted in POST #1 of this now very long THREAD: It's CRITICAL... how you set your transmission's vacuum system on your diesel MBZ...

Color: I.D. P/N:
Yellow……2.0 mm..……..1162760929
Red……….1.1 mm….…….1162761029
Blue………1.0 mm…………1162761129
Brown……0.9 mm…..……1162761429
White……0.8 mm…………1162761229
Green……0.7 mm…………1162761329
Black.....0.6 mm......... ___?_____ **
?????.....0.5 mm......... ___?_____ **

** IF anyone knows these P/N(s) and the color of the 0.5mm orifice, pass it along to me and I will go back and revise my POST#1!!
Regards,