Tie Rod Adjuster Sleeves

[MikeN]

I'm looking to replace the tie rod adjuster sleeves on my 64 C10 2WD with the double adjustable tubular units from CPP. CPP lists one part number for 1960-64 and a different part number for 65-66. I would have bet the farm they were all the same. Does anyone know what the difference is? I want to be careful to order the right ones because returns are a hassle.

I'm making the switch because I'm not happy with the quality of the standard sleeves I installed a few years ago from a local parts house.