Purchase the resin kit here: http://www.e2046.com/product/Gundam+Sandrock+Ver.ka+Conversion+Parts/3083/
Pictures: https://gemr.com/user/prime92?utm_source=Sam&utm_medium=Social&utm_campaign=Prime92
I sure felt dumb when I learned that the resin parts were for the old high grade instead of the master grade. I made it work though.