Ifor Williams Paddle Latch.
Lockable Inspection Door Latch kit for HB510XL & HB610.This latch will also fit the HB505 and HB510 Classic but you will need to re-use the bolts from your old one as the bolts provided with this kit will not be suitable
This latch will also fit the HB505 and HB510 Classic but you will need to re-use the bolts from your old one as the bolts provided with this kit will not be suitable