Some thoughts, since I am in the middle of trying to replace the factory bimini with an arch on my A25:
1) Cobalt may still have factory arches for your model boat, but they no longer do for mine.
2) Samson makes the factory OEM arches. They are easy to deal with.
3) Samson is running 10 MONTHS out for arch orders right now, due to COVID and demand. So if you order one now, you can expect in December or maybe January 2022. Not kidding.
4) No one, including Cobalt dealers, in my area will install an arch for liability reasons. This includes Cobalt dealers installing an OEM arch. I'll be towing my boat 12 hours each way to Samson's facility in Portland to have it done, assuming they can ever get me an arch in the first place. If you want to add an arch, make sure someone near you will install it.
5) The OEM arch style for recent boats is the Samson Dagger arch, which they do not make anymore but can maybe still produce one-offs for if they still have the right parts sitting around in inventory. I am waiting to hear back on my A25 fitment.
6) If you use the factory mooring cover, which is awesome, it will no longer fit once your arch is installed. You can either buy a new one designed for the arch, or have your current one modified to fit. Samson will modify covers and told me they will modify mine the same day they install the arch.
It's a fun process.
I would say that if you can find a boat with an arch, go buy that instead.
- Mark