I too can recommend a few folks in the DFW area who would definitely be capable of doing the pulley swap (and any other mods).

LantanaTX is also in your area, and he or someone he knows could likely help. The pulley install is quite simple and any decent MB shop would have no issues with it. BUT, you'll likely pay a premium at an MB shop so a smaller place may be better.

I'm sure LET (jerry) will help you out, but if you need more contacts let me know.

SQ