PSP Brushes

This has probably already been covered, but I've been looking for the twenty minutes and can't, for the life of me, find it anywhere. I have a question about PSP brushes. I'm using PSP7, by the way. I downloaded a heap of very nice brushes from absolutetrouble.com, and stuck all the brushes in my Brushes folder after extracting them, but they wouldn't come up. I realised this was because the brushes were made for PSP10. Which broke my heart.

So I'm wondering, is it possible to convert PSP10 brushes into PSP7-compatible brushes, or will I just have to find some new ones?