I’ve been beating up the internet for many hours and am skunked. I need to replace one or both of the extended range bladders on my G model. The replacement bladders (1200065-5&6 I think) are 22 weeks out. Apparently there is a service kit 182 SK-41, that replaces the cross over vent tube with a bigger version and the bladders that are appropriate for that mod are available today. The mod seems to make sense but I cannot find either the associated service bulletin, any part numbers or a documentation at all. Does anybody have any of this info? Thanks!

Call Textron GA support, they are surprisingly helpful; even with their older airplanes.

The Service Kit is found on the Cessna Support Website.

Thanks for both of those answers. I downloaded the pdf, there’s a lot of parts listed! I do think I’ll also do as suggested and try AirPower or Yingling next week and see if they can give me a package price.
The big driver was the 20+ weeks to get a new bladder for my un-modified old airframe. I got around the pressing need by purchasing a new-in-2021 bladder off E-Bay that fits my aircraft. That’s not the ideal answer but it should give me time to gather all of the parts for the service kit and new bladders and, hopefully, install all of that sometime next winter.
Thanks for the help!