[Zmagnette] engine rebuild question

[webuck1 at cox.net]

OK. I am 99.9% done with my rebuild. Here is my question for you rebuilders:
The head has a screw in part called screw- rocker shaft locating (on pg. 10, #92 of catalogue spring/summer 2014). The other three push in pieces that look the same as the screw are missing. Do I : 
A) Buy three screws and grind to push fit,
B) just use a washer and nut with no  lock plate piece # 91, as above.
What say you.
Buckey in hot AZ.