Best Seller | NiteRider Replacement Seatpost Mount for LED Bike Taillights Replacement seatpost strap mount for NiteRider taillights that works with most seatposts. Compatible with all NiteRider bicycle taillights but works best with the Sentinel 40 taillight. Features: Includes: One replacement taillight strap mount Specs... more | | $17.33 FREE shipping go to store |