who makes the largest oil filter for the 1500.
the fram oil filter I got is very small
As far as I know they are all the same size... there is limited space there otherwise. All the various brands are listed on the website/ mods/tips; Maintenance/Reference- you might have a look at them online and see if there is a difference in the capacity.
http://www.vulcandrifterriders.com/oilfilters.html
You might give this a look: http://www.gadgetjq.com/oilfilters.htm