Canon PROTECT Filter for the EF 50mm f/1.2L USM Lens

[brosen]

I just got my EF 50mm f/1.2L USM Lens today, reading the manual, it says to install the Canon PROTECT filter to seal the lens for Dust, Humidity, etc., do I need to buy that specific filter ?, or I can use any standard UV filter installed, currently I have installed the SIGMA DG UV 72mm filter, maybe that's enough ?, please could you confirm, thanks a lot