I guess you are referring to the fiberglass poles as the "support pole/hoop". There are no brackets used to hold them. Each end fits in a hole in the center of each metal frame. Then the tent has a Velcro loop strap sewn into it to keep the pole from slipping sideways. Here is a picture of a portion of where the pole fits into the center metal frame and the Velcro strap on the tent.
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The springs are fairly easy to remove. It is best to remove the support cables from the roof first. You should support the roof at about 45 degrees up from full open to do this. This relieves the tension on the cables to make it easier to remove the bolts on the brackets. I prefer not to unloosen the cable clamps unless adjustment is needed during assembly. Once the cables are removed, make sure the roof is secure. If the roof rotates down too far from fully open it will surely damage the fiberglass. At that point the center metal frame should be up at about a 45 degree angle and the spring should be near a free state (unloaded in either direction). The important thing is to unload the spring. Once that is done and cap is held in place, you can take the pivot bolts out of the center metal frame and slide it up and away from the end of the spring. The other end of the spring is held in place with a Cotter pin. I usually just let in rotate down and out of the way, then secure it so it doesn't bang against anything like the rear window.
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I have removed my roof a couple times while refurbishing. I have not experienced any damage to the structure by doing so. Just keep track of the bolts because some are different length in different locations. I have never replaced the hinges because I was able to reuse mine after recoating them. I think it would be a good idea to use the existing holes if possible. However if you can't, you should be able to fill in the holes with fiberglass and drill new ones without weakening the structure significantly.
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Sorry, I don't have part numbers for any items. I have always reused the existing parts I had except for the bulb seal and roof edge protector. The front slider latch is probably not needed because there is no access to it from the outside and those windows are pretty snug. I don't think they would work themselves open unless yours are loose. I searched for stainless steel outside drawdown latches and could not find any. I could not find any latch that was exactly like the original ones but there are some out there that looked like they would work. I just ended up recoating mine and reusing them.
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The first time I replaced the bulb seal and roof edge protector/trim, my brother provided them to me but the last time he didn't have them anymore. I was able to find something on eBay that worked but the bulb seal self adhesive didn't work very well. The adhesive worked initially but eventually lost adhesion in some places. I was able to use some good weather strip adhesive to fix that. I realized later that I could have bought the combination bulb seal with the u-shaped edge protector that slips over the edge of the roof fiberglass. I think this would have worked much better since it has a mechanical grip along with the peel and stick adhesive. If I continue to have a problem with mine I will probably redo it with the combination system.