I find locating the correct shock absorber size for vehicles to be a major pia. I'm tasked with replacing the shock absorbers for a 2006 Chevy Silverado k3500 Dually (work truck chassis).
Can anyone help me pin this down?

Note: I could measure the old ones but I'm not convinced they are correct. :/

Thanks.

 

Did you try a product finder or contacting the manufacturer?
https://www.kyb.com/catalog/