They are not OT-66s and from the pics I have seen of W-5032s these are different, the tread is almost more like OT-30s though these are not OT-30s, they fit on the regular sized Mid wheel.
The markings on the sidewall are "340/30/20 MT" "Bridgestone" "Kyosho" "Sand Super"
Are these are more recent wheel than the OT-66 that was used on the Ultima II perhaps?

