ok guys, hear me out on this. i was doing some research on different pins and accessories and from what i've found, a lot of things are close...or have certain qualities of the original, but fail to meet all three signs: the diamond knurls, the holes, the size (yes, i've seen some things that look dead on that are print press parts but are the size of highlighters :/ )
anyways, i've been just googling things and going between sites and it looks like gun parts might have something to do with the original part (and we all know lucas used lots of vintage guns to convert props.
most importantly sight adjustment tools
These parts are for the AR15 and M16, the AR15 was designed in 1958 and in service starting in 1963 (and still now). The M16 was designed in 1957 and put into service in 1960 (and again still used now)
here is the site and the pictures are below.
http://www.gunaccessories.com/AR15-M16Parts/SightToolsPinsAccess.asp
not saying this is what i think it is, i'm just saying here is another branch of research if people are up for it
i'd also like to add, in regards to the two bottom parts, if the part on the left was cut so the non-knurled end was trimmed, and just the end of the part on the right was cut off, they could be bonded, and the bond could be hidden with tape. then the part would only be missing two holes. towards the knurled end. or maybe there is a similar part i should be looking for