32vid, this is the HiPo Shop so his questions and comments are posted in the right forum.
There are several suppliers of the 3-5 window conversion kits. My guess is they all come from the same manufacturer. So, buy the cheapest. Having watched it being done I found it to be quite a job. Hope you have some serious body working skills.
Again, there are several suppliers of the S10 conversion kits, but, they are not all made the same. Do your research and get the best fit for your skill level.
Search the swap meets and ads like Craigslist for an original Fulton with the proper brackets for your truck.
There are many on here who have done exactly what you are planning. Browse through the forum search function and/or the Galleries pictures until you find one or two you like then send the owners a Private Message asking questions.
Good luck with your build.
