I can help you with your carpet needs, but the mfr. I worked with to create these carpets doesn't sell partial sets. They only offer a 6-piece set (full floor, rear wheel wells, and the tailgate piece.)
Be advised that the 60 and 62 are the worst offenders when it comes to carpet fading and getting ragged over time. With the newest of these trucks now being a minimum of 30 years old, the carpets are generally badly faded, so if you were to find just a portion of the carpet - whether new or used - it's unlikely to come close to matching the other carpet that's in your truck now.
I can assure you there's nothing you can do to your truck's interior that will transform it like new carpet. The difference is truly astounding!
If you're interested, PM me, and I'll respond with options and total (shipped) pricing.