do you have to change bolts to run doubles ?

i have two 60 inch exmark lazer z's with liquid cooled 27 hp kawasakis and i want to run doubles for the rest of my fall cleanup,do i need longer bolts?both are 2004 yr.

 

I use the same bolt, but I don't run eXmark.

 

Only thing you will need to change is your deck height (up 1/4") to allow for the lower 2nd blade on each spindle now.

 

We just add them on without changing the height, since we usually lower the deck for the fall anyway, allowing the leaves to blow better, and the mower to vacuum better, too.
In addition, Bobcat and other machines with drop blades, can use a straight blade add on without a height change, as long as you mount the extra blade under the stock one.