Gah, wish I would have seen this sooner. I could have saved you a LOT of coin. But I can still save you some headache.
See, I too used to be plagued with the bulb burnout and I see it all the time on the road on other liberty rides as well. I thought I posted the solution I found on here, but maybe I didnt. The simplicity of it is gonna make you real dang mad though. But will save you headache later still.
When you take all this crap apart... go straight to old faithful. That bulb that never burnt out. Take that baby out and pay direct attention to how it is oriented and also how it is oriented with the rotation lock. Look at the bulb filament!
Orient all your bulbs so the lock down in that same orientation. SOLVED. Not even kidding. If the bulb is not burning with that filament inside in that one position it will live a short life and repetitively burn out over and over.
I'm not smart, I just happened to be very frustrated and tripped over this fact asking myself WTF and wondering if just all the replacement bulbs were crap made to resell. So I went to pull old faithful out to have a look and replace her with what I thought was a crap bulb just to see if it would burn out in the good socket. That's when I noticed.
I have not had a bulb burn out since. Been so long now I can't even remember how long it's been. Been years.
A's far as the housings... I had someone smash into my jeep last winter storm and just drive off leaving me all jacked up. I was in the same boat and found some of what I thought were similar to OEM but cheaper. I could only afford the one at the time so I just got one and planned to get the other asap. I swear it's the same source as OEM. You literally could not tell me which one I replaced. Got it off Amazon. And no kidding I put my old bulbs in and saved the new. Still no blown bulbs.
It wasn't that I didn't like some of the other aftermarket look housings. They just all would look dumb on mine. I have the one on the manual cover. Dark red, charcoal bumpers and fender trim. OEM looks better with that combo.