Hey Brent, you kinda got my curiosity up on this part. (in some of my past projects I had to spend some time looking for rare/obscure parts)
Anyways I checked the parts list for STTNG and the Pinball Parts Database (http://www.moll.no/pinball/parts/index.php) and they do not list this assy for STTNG. (it is listed for others eg. The Shadow)
Looking at the STTNG manual on P. 81 you should be able to narrow down the exact parts that you need. If you don't have a manual or parts list, you can download both from the Internet Pinball Database.
For example, if you need the complete Line Filter Assy A-16970, it is available at Pinball Spare Parts Australia. If you need just the box alone A-14810, it is available at PSPA or Marco.
Wally