Yeah, take one to your local hardware store and look at the machine screws. Typically they have them in little baggies of a half dozen or so. If you need to know the threads per inch and size they will usually have either the nuts to go with them to try or you can align the threads on another screw. some stores even have threaded boards that you can try your screw in. Be careful not to lose your screw or accidently exchange them. If I am not mistaken I think all the Boogie screws are common standard TPI and sized. I don't recall having to look very hard to find replacements.
On the other had, the chassis straps are nowhere to be found.
Does anyone have a set for MarkIV? Preferably black but chrome will do...