vinyl window part?

Hi This is a casement window marked inside as SNE Corp (Crestline? the windows are from 1983). Also has the number It is aluminum clad window but has this vinyl stop around the glass. I was told I could paint the aluminum but that if I paint the vinyl part it will eventually crack. So I am trying to find some replacement white vinyl strips. I don't have a picture of it removed because I don't want to remove it unless I know there is something I can replace it with.

Hi, I am going to get a better picture of these strips when they replace the glass in the next few days/week. Originally I had hoped to have the strips here while they did the glass. But I also thought I could do it myself afterwards. But in an email with Jody, she suggested that you guys thought the glass might break if I were to take those off and I certainly don't want to break my new glass (although if the windows guys can take off and replace the old stuff certainly I could put on new? No?)

She also suggested I just paint it and that would be my preference. But the window guys said that if I paint it that the vinyl will start to crack in 5-10 years. I need to avoid that. IS there a paint that I could use on those strips that would NOT crack the vinyl, ever?

I just feel so stuck with this ugly goldy/brown color and I know I can paint the aluminum part but I just keep running into brick walls with these vinyl pieces. Thanks for any help or advice.

Here are the pictures. The glass guy says that ummm flange I think I would call it, wouldn't have to be that deep but that it does help protect the window that it is that deep.

For the front picture windows I also need some mull strips.

They broke one of the strips already, taking them out. They are trying to figure a way to put them back in that I can take them out again myself, if we can even find a replacement for these. I am guessing there is going to be more broken ones before this is done. :(

I have measurements too, if that helps any.

It's close, but not quite. Mine forms a Tee, even though it is not centered. There is a lip, I guess you would say. If you look at the picture that is showing top row on the right, looking on this page, you can see that bit of a lip on it. (the picture where the piece is straight across and there is a jagged end on the right end)