These two parts are designed to remove the play in the steering bar of the Challenge racing rig, where it connects to the seat frame.
One part is a bushing that goes around the outside and one part is a plug that is a better fit inside the tube than the stock tube.
The bushing has a hole on the underside which can be used to lock it in place with M4 screws or set screws if it's a loose fit. Assorted screws via my affiliate link.
Check out my other Playseat Challenge accessories as well:
Print the plug solid for strength. The outside bushing can be printed with 20% infill.
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