Chrysler used at least seven different manufactures who made harnesses in 1970, each one did things/used slightly different materials when they made their harnesses. The ones that M&H makes for YO is based on what they have found to be the most commonly used and are correct in detail.
If you buy ANY harness including a fusible link and it is different from what you have you can call M&H and they will work with you to make the harness look like your original. For example, most 70 FL have a blue square section where the lettering is, however I have found a few that have a yellow section instead of blue. Both are correct, however the majority were blue, if you need it to be yellow I am sure M&H can make one for you with a yellow section.