My 2013 Solera is on a 2012 Sprinter chassis, hence Amazon shows that the 7254 will fit that chassis.
I suspect your 2013 Solera is also on the 2012 MB Chassis. The Hellwig site doesn't even list the 2013 chassis
, but they do give the measurements that it fits, so you can check that against measurements on your Solera. If yours is a 2012 MB Chassis, no problem - that's what I put on mine (from Amazon). You may want to give Hellwig sales/customer service a call. My own best guess is that the 7254 WILL fit, but of course an ounce of caution is worth a pound of cure!