Yes, probably need spacers.
I think I replied to a similar post where you asked about fitting a mover.
When I fitted mine to a Folding Camper I made spacers for it.
I doubt you could buy anything off the shelf.
------------- I came into this world with nothing and I've still got most of it left.
As well is two words!
How does a sage know everything about everything? or does he? or does he just think he does?
Remember, if you buy something you bought it, not brought it.