This will fit the rotax vtwin engines such as original maverick and commander and all atvs. Includes front and back plate and box gasket. Must be used together. Does not include o rings for back plate. NOTE IN PIC 2 THESE ARE USED IN MULTIPLE APPLICATIONS AND HAVE A SPARE PORT ON THE OUTER COVER. GO TO A LOWES OR HOME DEPOT AND BUY THE 2" PIPE CAP IF THIS PORT WONT BE USED. THE EXTRA PORT DOES NOT AFFECT ANYTHING OR HURT ANYTHING AT ALL. IF WE HAVE THEM IN STOCK WE WILL SHIP IT WITH THE COVER.