Unscented toilet paper is recommended:

http://cartalk.cars.com/Columns/Archive/1994/July/01.html
http://cartalk.cars.com/Columns/Archive/1996/September/11.html

Hard to find the right size anymore (look down this page):

http://www.tagyerit.com/curiosities.htm

A more modern filter:

http://www.oilguard.com/side_menu/bypass_filtration/bypass_filters.php

And, for those of you looking for the original, for only $165, here is the Franz Filter:

http://www.wefilterit.com/

I will just replace the cartidge in my by-pass filter ('54 235) and adapt to a spin-on Fram Filter in my full-flow system ('60 261).

Tim