I have been working on the neighbors 4055 in this regard.
1. I got a Fehr kit. I like it. The folks are very friendly and helpful.
2. Get the plastic backed kit, even if it costs a little more.
3. Make sure you get the snap in cab post covers. I took ALL the glue off my cab posts because I thought I had to glue the cab post covers in but with snap in types you don't with some exception. This is a huge point because to get the glue off the posts I had to use the propane torch to heat it, then I could scrape it. It took me many many hours to do this. If I had known I had the snap on corner post covers I could have saved a lot of time and hard contorting work.
The exception is on the two front corner post there is a Velcro sticky, you will have to clean the areas this Velcro sticky goes to get good adhesion.
Now the middle of the cab, clean all the old glue off so the adhesive that you put the plastic backed parts on with sticks. I was able to get the middle cab clean with gasket scrapers and Goo Gone or other glue remover products.
By the way, while I was able to use a wire brush in some areas, the wire brush just smeared and then started to burn the glue. The videos make it look so easy......not at all.
4. I am in the process but the cleaning is done. The back two corner posts covers snapped right on, perfect. I am having a little trouble with the front right corner post cover, the edge next to the window/glass of the front glass turned out a little wrinkly, even with the 3 Velcro strips. My plan is to use a thin strip of adhesive next to the window to fasten it and hopefully it does not turn out wrinkly. (This is a highly technical term,
)
I have yet to glue in the rest of the parts but it looks really straight forward. I was warned to make sure surfaces you glue are very clean.
5. I am leaving the current window seals as they look OK. The door seals are getting replaced. I have the old door seals removed and cleaned. I will put them in last.
Good luck.
Paul