Blown fusable link
 

How do I find the correct replacement fusable link for an 83 RX7. Its the main to the ignition. Is it just by color code for the correct value?

Some guys just replace that link with a Spade on each end of the wires and put in a Replaceable Fuse like the ones in an FC..

But if you look at this link you can find the fusable link.
https://www.mazdatrix.com/79-85Electrical-Chassis.htm