Appreciate you all who took a little time to read my post.

Finally getting the 1949 Chevy 3/4 ton truck looking a little better. Sprucing up the interior led me to install a new headliner. Only after trying to install it did I realize putting it in wasn't as straight forward as it seemed.
I understand the 1949 Chevy truck came in two variations; the early 1949 models and the later 1949 models. I am pretty sure mine is the early model 1949 as the headliner center bow is screwed to roof of cab instead of the "floating type" .
I am real sure I specified this when I order the headliner but now I am not sure which truck I have.
The rear piece was a pretty easy to figure out but the front piece I am a little perplexed about how it would be supported in the center.
Also, the two headliner pieces I have are both too big in depth. I think if I were to trim them back they would fit but trim back by how much? The original headliner is long gone so no template. Any ideas of the size I would need to trim these down to? An installation video, wedsite or a diagram would be really helpful or just some old fashion advice on what to do would be great to. Any help would be greatly appreciated. Thanks!