Want to rebuilt K26 turbo, where do I buy the kit?

[Martin Pot]

I just bought a used K26 turbo, and would like to restore myself. I know
there are kits available come with everything you need. I just want to make
sure, I get the best materials and wondered if anyone has experience doing
this. This turbo is just going to be my spare for the '86 5CSTQ, but might
decide to go ahead and change it, and renew the one that's on there now,
too.
Thanks, Martin.
91' 2CTQW PRL   '86 5kTQ PRL  91' 2CTQ Maroon  All cars chipped