The T'au XV104 Riptide Battlesuit is a single large suit with swappable primary weapons (heavy burst cannon vs ion accelerator), secondary weapons (smart missile system vs plasma rifle vs fusion blaster), and a shielded missile drone. The recommendations below cover weapon swaps, the 80mm base, and flight-stand options.
Use 3mm x 2mm disc magnets for the side-arm options, the same size used across all T'au Battlesuits.
[Buy Product=100pcs-3mm-x-2mm-1-8-x-1-16-disc-magnets,Variant=All]
Use 6mm x 2mm disc magnets for the main weapon swaps (primary cannon and secondary).
[Buy Product=50pcs-6mm-x-2mm-disc-magnets-n52,Variant=All]
Base Magnets for Riptide Battlesuit
The Riptide sits on an 80mm base. For the flight stand, the Large Flat - Tall is the recommended choice and pairs cleanly with a magnetic miniature case for transport.
[Buy Product=2x-large-flat-extra-strength-magnetic-flight-stands,variant=14030251360340]
For a drilled base magnet, use the Large Thick Flush-Fit Base Magnets, 6mm x 2.6mm. Use 1 magnet if you transport the base separately, or 2 if you transport the model on its flight stand inside the base.
[Buy Product=gw-flush-fit-base-magnets-large,variant=39439165882452]
If you want a base with magnet holes already preset so the magnets cannot pop out, use the 120mm oval premagnetized base.
[Buy Product=bases-premagnetized-warhammer,variant=30427499921492]
For a peel-and-stick option, use 3 of the 25mm Peel & Stick Inner Base Magnets spaced in a triangle inside the base, with no drilling required.
[Buy Product=flexible-self-adhesive-magnets,variant=51483453784354]