Hi y'all. Joined just to add to this because since I was a kid I wanted one of these light fixtures (yeah I'm a bit weird).
Over the years I have collected the info and parts.
Angelo P/N 70180 is still available on eBay from time-to-time. I have collected several of these myself. Good thing about them is that they use a common bulb that is replaceable, a T7.5 bulb fits just fine (that may have been an EXIT lamp or appliance bulb in the 50-60's).
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Then I went on eBay and sourced a "dresser lamp" as similar to the HM style as I could find. I seem to have found one with the correct glass shade. These are still widely available on eBay as Disneyland used off-the-shelf glass shades. Finding the EXACT fixture Disneyland used may be more challenging. I found a very similar fixture, but I suspect the Disney techs made the HM fixtures from parts cobbled together that they found. My hope is that some day I can find a similar ceiling fixture. The glass is easy to find, it's the fixture that is pretty unique.
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And to top it all off, I have found a great option for the "unstable gas flow/subtle flickering" effect from a guy named Jerry who makes a product called "Simflame". The P/N is LM015 for a plug-in lamp, and if you get a ceiling fixture you can opt for LM011.
A few things to note:
I wouldn't suggest LED style mantle. LEDs, whilst theoretically a good idea are not ideal for reproduction of lighting effects, primarily because they are not 100CRI. Yeah, it'll "work", but the Angelo 70180 is either 25 or 35 watts, and with a Simflame dimmer is much less than that. You'd NEVER see a savings on electric rates going LED for a lamp you'd rarely use (or even if you used it frequently), and the poor CRI of LED would seem "off" for the authentic effect from Haunted Mansion.
Set the "Simflame" to the "subtle flicker" and "dim mode" for most authentic HM operation.
The parts are not "unobtanium" to my surprise, eBay has lots of the things we need (not Jerry's Simflame device, though) like glass shades, Angelo 70180 bulbs and if you get lucky, an entire ceiling fixture.
Hope y'all find this helpful, if you are as weird as me and "need" a Haunted Mansion authentic lamp! You can always justify it as a good Halloween decoration....