Magnum/727 in a early A body.

So, looking at the drive shaft length chart from above and this diagram...

https://www.forabodiesonly.com/mopar/attachments/rearaxledims-jpg.1714835254/

It looks like the difference in length from an 8.75 and a 7.25 rear end is 2.26". A drive shaft from a 66 valiant with a 904, in front of an 8.75 is 49.58". Looks like the final dimension would then be 51.74.

How critical is drive shaft length. If I get a drive shaft from any of these...

2533192 1967-69 2.75 51.43 904/833 7-1/4 225 273 318 Barracuda Valiant
2852161 1968-69 3.00 51.50 727/833 8-3/4 383 426 440 Belvedere
2852212 1967-69 3.00 51.53 833 8-3/4 273 318 340 383 Dart
2996137 1973-76 3.25 51.89 904/833/230 8-1/4 225 318 340 360 Duster Dart Sport
2883758 1972 3.00 51.96 904/230 8-3/4 225 318 340 Dart

which would be the best to use with our 65, 904 in front of a 7.25? I'm hoping the first one will work since I have a 69 Dart /6+7.25 car back 'round the shed'.

I'm asking here without actually measuring it because the new motor isn't in yet and if I need to go hunting for a DS, then I'd like to have it on hand when we install everything.

Any opinions?