Haven't tried any, but after needing some for cars I took a long look at the reviews for import injectors. Seems like most are hit and miss at best. I know John Deere owns A&I parts and we have bought a few of their aftermarket parts, so far so good with them. Looks like the part number for them is A-RE37503. Might need grommets which are extra.
Here is one on the bay for $40.
injector
I have ordered parts from Pensacola diesel and have had good luck with them as well. They have a listing for them on the bay as well $57 if you buy 2 or more.
injector