There really aren't any add-ons for the Anaconda.
First, there isn't much made for most revolvers since the parts aren't drop in like automatics and so people don't try to Accessorize them.
Second, the Anaconda was a fairly short production time revolver and no one bothered to make anything other than grips and holsters.
As far as I know the only accessories for the Anaconda are holsters, grips, speed loaders, and spring kits for a lighter trigger pull.