It fits in the spacer under the driver's seat where the Westy fridge
relay usually is. Turned on it's side, it will bolt to the seat rail
support box like the Westy relay.
I have one in my hand and it measures roughly:
3 1/2" tall,
3 1/4" wide,
2 3/4" deep,

Personally, I prefer to mount the unit down inside the driver's side
battery box, in a little recess where the seat belt wires are. This is a
tight squeeze and requires trimming one of the mounting feet of the
relay so the relay can go in closer to the wall. The advantage is that
this space is otherwise useless plus all the wiring is safely tucked
away where nothing can bump it. Models with a vented compartment under
the driver's seat don't have quite enough room to do it this way, but
these are rare.

Mark

Loren Busch wrote:

>  RE: Combiners
> Mark, one quick question on the Sure Power 1315.  How big is it?
> Would it be the right size to replace the stock relay setup without
> moving the mounting point?