I am trying to find out the size for the fusible link that comes out of the bulkhead and goes to the starter relay.Any help is appreciated. Thank you

Might see if the diagrams on www.mymopar.com have the gauge listed. Hit tools/reference on the left side then wiring diagrams on the next screen on the right side then 67 belvedere

Okay I will try there . Thank you

YearOne probably has reproductions of the originals.

Year One does have them. I bought for my 67 GTX last year and it works fine and is an exact match to the orginal. Cost was about $12.00

Color coded at NAPA

I just made one for my 69 Dart 340. I bought fuseable link wire at NAPA and some new terminals and it was easy. I found a part # along with a pic of the terminal in my parts catalog and showed that to the dude at NAPA and they had the exact terminals!
I am pretty sure mine was a 16ga. They actually had a fuseable link in the catalog at the store for this car but it did not look (at the time) to be heavy enough gauge wire, so I made my own out of 12 ga. I will change it out as a fellow club member gave me a stock one he had and it is 16 ga. Sure seems light for where it is in the system but then it is designed to fail quick and "save" the rest of the system. Which is what my original one did when I "stupidly" forgot to disconnect the battery when changing the alternator and grounded the system out...doah!