Since the adapter isn’t included in the RRP Screw-On Mini kit, I set out to find one that would fit my RockShox Lyrik. Unfortunately, this adapter is rarely available and typically sells online for 10 euros—plus another 10 euros for shipping… and I’m cheap.
This custom design fits perfectly on the back of the fork crown and uses the RRP bolts provided with the original kit.
Only one extra M3 bolt and two M4 nuts are required.
Printed in PLA on my trusty Creality Ender 3.
Assembly 
Surface towards the fork crown 
Surface fitting the RRP Mudguard
