I had to get some screws from the local bolt shop for this with my Losmandy DUPS. Basically I showed them the WO version and had them order some "Stainless socket head cap screws" in half the length. I did this when I was swapping out all of my Celestron screws with decent stainless machine screws, so while I have a list of screw sizes, I'm not exactly certain which ones were used for this
I do know that I am much happier with the results.