Pin breakage is somewhat common woth the MTX 75....I suggest you purchase the Forcus Shifter tower and assembly. It uses larger pins and balls to keep your shifter linkage connected and it will bolt directly to your trans. I did that to mine, rebuilt my trans and have a quaife and fidanza combo.....and it shifts great!!! I hard shift all the time, and about onece every 2 weeks i insepct everything on my car, and the shifter linkage has shown no signs of ware.
true the focus towrer is expensive, but it would be better in the long run than replacing the pins with stoc or from a junk yard....you don;t know how the other person drove it, you could get something that will only last a day, maybe a year.
All in all i understand you need to fix it right now, even if its a temp fix, but down the road i reconmend getting the Focus shifting tower assembly. Its better and you will save money in the long run, than replacing the pins every time it breaks.