You can't get the old-style nozzles anymore. The molds they were made in no longer exist. Re-use the originals. It isn't so much the flows not being matched, so much as the one-hole designs were less prone to clogging, along with adding a bit more close-in coverage (this change coincides with Rainbird introducing their Rain Curtain nozzles) ~ Oddly enough, there is a way to obtain more of these nozzles, if you must, and that is by buying a Signature rotor, that is the Nelson version of the PGP. The Nelson nozzles copied the original red PGP nozzles.