I've had my Magna guards for almost 3 years now. I just went ahead and bought stainless allen bolts of the proper length, and in a few different sizes. Some sizes I use just for the sissybar, and a bit longer ones for the sissybar/guards combo. The best fit for the guards/sissybar is sissybar first and then guards, and that configuration should be intuitive the first time you try and mount both just from the way the mounting points are shaped. Just take your stock fender bolts down to a good hardware store so you can match thread size and diameter. You'll also want to pick up some anti-sieze compound to prevent galling of the threads. These nut plates on our fenders can sometimes cross thread a bolt, and the anti-sieze helps to prevent that from happening IME.
I ordered my bag guards from
MAW , and they get them from MC Enterprises. MC's part # is 143. I'm sure you can just as easily go down to a Honda dealer and buy from them. Here's what MC lists: Saddle Bag Guard (Honda VF750 Magna & Deluxe 1993-2003)
I change out my bike quite often from having the sissybar on, and taking it off when riding solo....about once a week. Bag guards I only use on trips which is 3-4 times a year.