Early Dart Headliner Install Question

I ordered a headliner from Legendary and noticed the last two listing channels are way longer than the listing wires/bows. Is this normal?? (bows are centered on the headliner in the photo below)

I realize they need to be trimmed a tad when installing to allow the headliner to be pulled down tight, but the rear one is about 12" long on each side, while the one forward of that one is about 6" long on each side. I'm guessing this is just beacuse the same headliner is used for a sedan with the longer rear bows and mine is a hardtop/GT? Have you guys run into this? I'm assuming I just trim them accordingly?

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I think that's because on some models the last bow goes all the way down to just above the rear seat. My 2 door post happens to be one of those. Haven't installed mine yet (hopefully in the next month or so) so I can't comment on whether or not it works to stay in the listing channel all the way down or it has to be cut and run down outside the channel behind the headliner. It's either that or it's just easier to run the channel longer than needed to be "trimmed to length"