have been looking around for replacement springs to redo a few of the short 10 round Pmags, have been unable to find anyone who has them, not even on the Magpul site, did send them a message but no one has got back to me, that was a while ago.

My question is, does anyone know where to get them from? found plenty of 30 round springs, and even 20 rounders, do I just go ahead and buy some of these and cut them down to suit?

If you feel the need to replace springs just cut down a spring from a 20 or 30.  Why do you want to replace the springs?

I live in the tropics where it is warm and humid and often raining, around 12 ft/year, mag springs are getting rusted, looking to replace and go with something more resistant like a stainless, did think it would come down to having to cut down some 30 rounders.