Source:
https://www.daddycow.com/blogs/view/114709/waterproof-turn-signals-for-ktm-off-road-and-enduro-bikes
While specific brand recommendations vary, there are several types of indicators known for their off-road durability. Compact LED pods with epoxy-sealed internals are popular among enduro riders. They are small, lightweight, and incredibly tough. Another option is flexible, strip-style indicators that are completely sealed in a silicone casing. These are virtually indestructible and can conform to the curves of your KTM's bodywork, reducing the risk of snagging on branches. For a more robust solution, billet aluminum housings with glass or polycarbonate lenses and multiple O-ring seals offer premium protection and a high-end look.



