What is the Correct Battery Cable

I'm looking to replace the battery cables on my 72 340 Swinger and purchased these cables (on the MOPAR box) on Ebay which are about 42 inches long. I relocated the battery to the trunk along time ago and would like to reverse that change. I didn't keep the original so I don't have a cable to compare with.

I was talking to a friend today that warned me that the positive cable may be to short that he made the same mistake and that the proper ones will be a bit longer and should have the fusible link (the enlarged portion), so I found this cable that's 50 inches long 6 to 8 inches longer then the one I purchased. Any help would be appreciated.
I believe thats the correct one(2770662), it sure does cost a lot though. Been looking at another one that costs 30 dollars but I'm don't want to buy until I'm sure it will fit too. 3764166