i bought a ls windage tray and oil pick up from someone on H-T and when i went to install the oil pick up, it didnt line up correctly with the windage tray. Do they differ from generation to generation or are all ls windage trays and pick ups the same?

 

All the ls p/u and trays are the same.But the gsr p/u and trays are different to clear the main girdle.Sounds like you have some gsr stuff.
Glenn