Welcome to the Forum from NH.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please.
I took a quick look at my online parts catalog, and it looks like these parts are discontinued by GM. So, you'll need to go to a salvage yard with a ruler and find the longer shaft or different steering box (whichever is really the mismatched part), or possibly look on eBay with the part number and see if an aftermarket compatible part is available.
Other members of this Forum much more knowledgeable than me in this area will chime in with hopefully some more/better options for you.