There's a cache of NOS VW 1500 chrome tailpipe tips currently for sale in the Samba classifieds. They're very reasonably priced, so get them while you can.
This part was originally intended for the 1500 Ghia, as suggested by the 343 part number. I was able to confirm this by checking the early parts book. Later it was offered as an accessory for the other VW 1500s, and I think it may have even been standard equipment on the 1500S models.