need help finding md5 salt..

[Rolf]

md5($salt.$pass).
Your hash should look like 70XXe51f7XX1b7916XX25eacc3XXb317:8972mekolat0 .
However, if you do the math, you will learn that bruteforcing a alphanumeric string of 16 characters is futile.
For 1000 7970s, for instance, it would take ~30690.4 years.