XL timing belts or substitute

I am working on a XY table and have perhaps built myself into a
corner. The x-axis is 48" and I was planning on using an XL
Geartooth timing belt (96") to drive the router trolley across this
distance. Now I find that these belts are only available up to 77
inches. Therefore, I need suggestions on what I might use in place
of the XL Geartooth belt.

Many thanks in advance for any thoughts.

Bill