I attached a picture that shows where the 17-1/2 inch measurement needs to be taken from for one of our landing gear kits to fit directly. You might double check that you measured from the right place.
Otherwise you could just have the brackets removed from your trailer by a qualified welder and then install the brackets that come with the Bulldog Tandem Landing Gear Set # BD500162. Either way this landing gear set would work well for you, you just might have to have the brackets of your... view full answer...