After forgetting the too-long-to-fit-the-kit Clark rods on one outing, I returned to Harbor Freight for other stuff, found the short rods were actually 13" each with threads, and bought the 10' kit of 10 for $9. That gives 2 sets each totaling the same 51" as in the original equipment. Plus 2 spares.
They worked very nicely overnight, no matter the engineering preference to have the apex of an arc be in the middle of a segment rather than at the union of two. Especially at the head end, the fabric channel on the NA and NX models supports the union well.
So, I'm pleased to keep the rods together with the Clark bag. At worst, the yellow are cheap backup; and at best, they can remind me, again in yellow, to take the Clark OEM rods, if those are not too long.