If all you want to do is fix your crank and have little use for an entire die set (note the spelling), I would suggest just buying the die you need. I fixed a Sachs crank a few years ago and just spent about $5 for a quality die in the size I needed. Granted, I already had access to a die holder but you can do without. Crank threads are tough high carbon steel and you want a quality die that will hold up. I bought mine at Napa but you should be able to get individual sizes elsewhere. I like HF, but not on precision items like this.
Depending on where the threads are damaged, you may need to use a thread file to get a good lead in. Last thing you want to do is get the die out of alignment and double thread it.
Thread repair tools are the best but super expensive.