If the panel will not be on a MPPT controller, meaning just charging a 24V battery,
then can simply leave them out.
The RatShak diodes are listed as 50V which would be considered a bit low for a 24V system, depending on who you ask.
Never know what will be in the package at RatShak, they may be 100V or 200V if you check the numbers on the actual parts.
The 6A05 is 50V, 6A1 is 100V, 6A2 is 200V, 6A4 is 400V, etc.
G-