My gravel bike is currently resplendent in whatever guards were nearest to hand last time I went out. The front is still bare as there is not a lot of clearance and nothing I have fits under there. The rear is wearing the rear SKS Rowdy guard off of my son’s 24” MTB - it does a remarkable job on the 43x700c tyre given that it’s for a 20-24” application. A bit of a fiddle to fit and now my son’s backside gets muddy, but needs must.