I figure this is a long shot. But does anybody have the actual length of these cables measured out?

I am relocating my battery to the front under the headlight and want to verify that these will comfortably reach before I spend the time finding them and then pulling the cables from a car.

To be clear, these cables are used on cars with the battery under the rear seat.
From what I have read, these cars have them:
Mid 90s Aurora & Riviera. Around 1999 they changed to a revised cable which is still similar.
2000+ LeSabre, Park Avenue, Bonneville.

https://www.fiero.nl/forum/Forum2/HTML/128284.html
https://www.fiero.nl/forum/Forum2/HTML/127541.html

You should be OK. I created the first thread you listed. Unfortunately I did not measure their length, but I had to shorten my cables about 18" for my application. I routed both cables (I ran a long one for the negative) from the starter and the trans/engine bolt on a 3800 to the front. I would guess that you will have sufficient length available to get to the headlight area. Probably about 6" was used with the turn to the battery box too.