Ask for shocks for a 53 rather than 49.
My advice is go to the Napa across from the valley mall that used to be Gap Auto. Look for older Hispanic gent on the far right end of the counter if he is still there or the woman with the bad haircut. They are some of the best parts people in the Yakima valley and both have worked parts for years on end well before computers. If he is still in that store the 50 something Hispanic gent was one of my students and is real sharp but I think he is usually doing manager duties or has the commercial desk. Not the cheapest place around but they know their parts.
the Monroe 5826 is the basic 51/55.1 front shock that you can upgrade from.
The Gabrial 81270 is a basic gas shock for these trucks Both of those numbers can be crossed anywhere and if you want an upgrade you can upgrade off those numbers.
https://www.rockauto.com/en/catalog/...k+/+strut,7556