Paul I can't help with a 41 but I did install a 1 piece fiberglass headliner in my 52 and some of what I learned may be helpful.
First of all the shipping was almost as much as the headliner- over $100 as I recall. It was the same cost for shipping from the midwest as more locally but both vendors claimed it was not being drop shipped from the manufacture.
I ended up trimming a little from each side and took too much off. I blame my wife- usually my last choice for a helper but what can you do. We didn't have it fully compressed into its final resting place. That is not especially easy to do short of having the cab turned upside down. The fiberglass does bend somewhat but until it is actually in its exact place it is easy to feel you need to do some trimming. I had to add some metal trim above the door window to hide my mistake and help hold the headliner in place. In retrospect I think the headliner may have fit without trimming but it would have been difficult to install it that way.
The fiberglass needs to be painted. I went rogue and painted mine to match my seat and door panels. I didn't want gloss paint and had the paint store add flattening agent to the paint. It came out shiney anyway.
A couple of pics showing my results.
http://i99.photobucket.com/albums/l286/Hookalatch/Chevy%20Truck%20Finished/IMG_3016JPG.jpghttp://i99.photobucket.com/albums/l286/Hookalatch/Chevy%20Truck%20Finished/IMG_3008JPG.jpgI went the fiberglass route because of all the problems I heard about the fit and finish of the cardboard pieces. If I were to do this again I would at least try the cardboard. On the other hand I am quite happy with mine and it will probably still be in good shape long after I am not.
Chuck
