You can use the splinter guards that came on the rails. Unless you use the panther ripping blade, if the guards are in good shape you shouldn't have to replace them or remove them and reposition them. ( The panther ripping blade has a wider kerf and eats some more of the rubber leaving you with a strip that doesn't align with the cutters produced by all the other Festool blades.)
What is stated by Peter above is correct. Note that Tenyru has recently begun to market blades designed to Festool's circular saws. I have one of their new rip blades for my TS 55 which has a listed kerf width of 2.0mm. If that Tenyru blade runs true it should result in not having to replace or reset the splinter guard once trimmed with Festool's 48T Fine Tooth Blade (Item #491952) that is supplied with the TS 55 saw, which blade has a kerf width of 2.2mm.
Here's a photo of the new Tenyru rip blade.
I have not yet tried out this blade so I cannot confirm if it will not cut additional material off the splinter strip of my Guide Rail that has been trimmed with a Festools 48T Fine Tooth Blade (Item #491952). I have a 10 inch diameter Tenyru Gold Medal 40T combination blade on my cabinet saw and have been very pleased with its performance, so I have high hope for their series of blade designed for use with Festool saws. Saw blades are Tenyru's primary business.