You will definitely require an adapter to mount a 70mm PCD wheel. Any wheel you could somehow affix to the 3 bolts on the Simucube base side could be too close for knuckle comfort/clearance to monitors.
Google "Simucube wheel side QR" for some options. Prices--and delivery times--vary widely. Ricomotech looks fastest, but the cost is dear and other vendors are UK/Europe based.
Google "Simucube wheel side QR" for some options. Prices--and delivery times--vary widely. Ricomotech looks fastest, but the cost is dear and other vendors are UK/Europe based.