ROBBINS TECHNICAL NOTES 2920: M2 style top for 1990-97 Mazda Miata. This top has a non-heated glass rear window and No Zipper. Unlike our 2912 and 2913 tops, there’s no unzipping required before lowering the top, making operation identical to that of a 1999-On Miata top. 2921: Above top with Rain Rail 2922: Essentially a 2920 top with Heater/Defogger glass 2923: Above top with Rain Rail
Installation of bow straps at the rear of the top frame allows the top to safely raise and lower with nothing to unzip (Just as used on 1999-On Miata tops).