Do you have any idea on a part number that you used for the specific spacers as well as the length of the bolts? Were they threaded spacers or just a plain hole? Thanks, looks like a cheaper option.
On this website
http://www.mcmaster.comenter this part number
92510A829
This number is for the 1.5" long unthreaded aluminum spacer
then this page (the catalog page link on the left)
http://www.mcmaster.com/#catalog/115/3209/=jl9yxThis page has all the sizes available. I used the 1" OD with 1/2" screw size.
I actually bought several different lengths to experiment with. I ended up with the 2" spacer on the right side due to the tear drop air cleaner. The normal air cleaners would most likely do well with the 1" spacer )or maybe the 1.5)
I used 1/2 stainless cap screws, also available from the same site. Don't remember the length, I'll see if I can find that info.