68 dart super stock springs flexible brake line to order?

Hello,
I'm working on my newly acquired dart over the winter. It has an 8 3/4 rearend in it shortened from a b-body donor by previous owner. I noticed with the car on jack stands so the rear end is hanging by the super stock springs only that the rear axle rubber flex brake line is pretty tight when in this position. It's also pretty old so I want to order a replacement. Should I order a stock replacement line or when using super stock springs is there a different part # people are ordering, perhaps an 1" or 2" longer? Thanks Greg