Got a Z28 without T tops and have regrets now that the weathers changing. Does anybody know of retrofit places or kits?

 

I have seen many people on this site that have done t-top conversions themselves, from what they say it really isn't that hard. All fixed roof cars have the same t-roof structure underneath as t-top cars do. Here are some pics and install guides I found:

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I'm not sure how mechanically inclined you are but many people have done this switch that have no experience with body work etc and they said it wasn't too difficult. You can pick up all the parts for the conversion in the for sale section here usually for around $250 - $300. If you didn't want to do it yourself I would bet a place that installs sunroofs may have had some experience with this.

Good luck!