How many players can a URC club register, and can the South African teams pick foreign players?

Under the URC competition rules:

• Each club may register a squad of up to 50 players for the season.
• The registered squad must include at least ten front-row players (props and hookers).
• A South African club may include non-South African players in any match-day squad, subject to the approval of SA Rugby (the South African Rugby Union).