Question about Platinum Sun & Shade Sorrento

Good day,
I have the same question, what is the hole spacing between the holes?

According to our research, the base is specially designed for the following free-arm sunshades from Platinum:

Challenger T¹ / Challenger T²
Voyager T²
Riva (centre pole umbrella)

Unfortunately, we do not have any precise information on the hole spacing from the manufacturer.