Which dually valve stem extender?

Going for a new set of tires in a few days. I went to check the current tire pressure and I could not get to the inside tire stems on the dually. Tire store said they didn't have any, they would be installing regular steel stems. I see lots of them on Amazon ( so I can get them here in a couple days ), but no clue what works best, on a budget. There are lots of them using a braided steel hose. Some are all metal, but curved to certain degree's ( no idea which degree to buy ).

I liked the type that airs both tires at the same time, but those are $56 per side.