Trailer Help Please :(

[bigbellytom]

Ive got my monterey 180 sat on an SBS trailer, brakes were shot when i bought it so looked into getting new parts... big NO NO!!
Ended up buying 2 new marine AL-KO axels with brakes... etc!! got them on ok... but also bought a flush kit and it doesnt fit??

Has anyone had experience fitting these flush kits? Am i missin something obvious as i dont want to have to drill into a new back plate!!

[gar163y]

I bought two flush kits last year and did have to drill the backplates. Some backplates have rubber bungs in holes threaded to accept the hose ends but I wasn't that lucky. I needed skinny BSP nuts with a touch of Loctite and haven't had a problem.