Help with TTI X Exhaust

Ok...fixed the front hanger issue with a BFH...now they hang correctly...

So we crawled under the car and went to install the x-p and elbow to the headers.

From inner outside of the left ipe to the right pipe (headers) I get 17 1/2 inches.

The x-pipe with elbow I get 19 3/4 inches. Do i cut the elbow where the dotted line is ..and a little over an inch ?

This was easy ? Pehaps itis because mine is a '75 ????

Thanx
Ian.