The first picture is bogus. This is a Model 93 and it never had this light on it. Someone just made this up.
At one time there were two people who were reproducing the goose neck piece and the plate under it. Unfortunately, neither are doing it anymore.
As for the rest of the upward pole, it is simply a 3" (I'm guessing) piece of pipe and above it you can use just about any company's light. It appears that original ECO Islanders used Revere lights, but any one that will fit the pipe will do. All Revere lights like the ones you are asking about came with holes in the top for the attachments, you could add as many as you wanted, many of the Revere bonnets that I have had did not have Revere spotlights on the as any lights would fit.
As for your second picture, this Islander uses a bracket that sits on the Islander and there is no head. I used to have two of them, but I can't remember if I still have them. Will look for them.
You need to attend gas shows such as Columbus which is coming up in mid-June and IG which is around the first of August, this is where you will find this type of lights.
If you need pictures, check out my website: www.petrocollect.com
Just follow the ECO thread. We are the worlds largest supplier of ECO parts, just let us know what you need.