I inquired about the red & white jerseys on the GRG Facebook page. Below is the answer they gave me.
Grand Rapids Griffins We sell our special Friday jerseys at the end of each season in an auction following the last Friday home game of the season, this year's design will be sold on April 19 - check eBay for one like the one shown above, as The Zone - Grand Rapids Griffins Store unfortunately doesn't offer replicas.