Jacuzzi PowerPro LX Jet Assembly Without Stainless Steel Escutcheon.
Replacing the jet insert is a common repair to make in Jacuzzi 300 series spas made from 2002 to 2006. This jet insert will have missing or broken tabs that are responsible for holding the jet insert in.
If all you need is the jet face/insert for spa's made before 2007, order parts #'s 6541-470 (#1) and 6541-471(#6). You'll need to glue part 6541-471 jet back adapter into your exsisting jet back/waterbody to accept the new style jet face. This will fix the "broken tab" issue with older style jet face/inserts. Very simple repair to make. (Might sound complicated, but when you have the parts in hand, you'll see how easy it is)
If your spa was manufactured before 2007, you'll have to replace the entire assembly if you need to replace the jet back/waterbody.
If your spa was manufactured in 2007 or later, all is good. These are current parts and numbers.