your pic looks pretty much the same as the std engine mounts but guess yours will be maybe have a harder grade rubber for more stiffness, the item 6 is the 4th mount rubber everyone seems to fit inc me(std on 172/182 i believe)
and makes a big difference to stability of gearbox and better gear shifting this you probably know already the only extra strap which come to mind is the one that bolts to back of gearbox on top and on the front of box if you have the straps stick some pics up sure they could be identified if not let me know i can get a pic of one i have spare hope this helps