Bell shells for early Williams machines and early Gottlieb bell assembly wanted.
First, I am looking for bell shells with diameter of 4" and diameter somewhere between 2-1/2 and 2-7/8" for early 1950s Williams machines. These are for two missing bell shells from a Williams Nifty (1950) (that are shown below in photo of a machine that has them--photo from ipdb). I haven't been able to confirm the size of the smaller bell shell but based on the length of the armature on the stepper (and rough calculations of sizes from the photo), it looks like it has a diameter somewhere between 2-1/2 and 2-7/8" or so.
Second, I am also reviving an older post from a few years back for a 5" bell assembly for a 1953 Gottlieb Grand Slam as shown in the photo below (photo is from a 1954 Gottlieb that has the correct striker assembly in it).
Pinball Resource has a reproduction of a newer version of this assembly (see http://www.pbresource.com/news/gtb-b9359.jpg), but this newer assembly is too large for where it needs to go in Grand Slam (right behind the 10k stepper). The main difference between the one that was originally on Grand Slam and the reproduction is how they are mounted in the backbox--the newer one is mounted off the board (with four screws) while the correct one is mounted nearly flush to the board (with two screws).
Here's a photo (from ipdb) that shows the bell assembly in a Grand Slam.