I would go with Z1 Howe or Koyo. Lots of folks have them here in the forum. May need to trim the shroud a bit if you are going with either of these two. Just search the forum and you will find your answer.
If you want to go with an oem replacement, I have used good condition ALL METAL OEM replacement for sale. I'll sell it for $80 plus shipping. It will come with the radiator cap. It worked well for my car. Please read my profile for my mods and power output. I can send pics if you would like.