When I wrote the first Gas Pump Identification book I included a lot of lubsters because I just didn't have enough pictures of gas pumps. The second edition included even less lubsters and more gas pumps. The third edition which I just wrote is truly a gas pump book, no lubsters, nothing else besides gas pumps. So if you can find someone who has a copy of either the first or second book you'll see pictures of what you are asking about.
I also have a website that lists almost everything that a pump company made.
Go to this page of my website: http://petrolianacollectibles.com/gas%20pump%20literature.htm
Click on Bennett first, many of Bennett lubsters are listed under "Highboy."
As for other companies that made lubsters, Tokheim and Wayne made many, but to access pictures of the lubsters on the above website you will need to know the model number.
Here are some Model numbers for Tokheim and Wayne:
Tokheim: 330, 340, 341, 353, 356, 357, 460, 461,
Wayne: 5561, 3062-W, 3063-W,