Look to see if you have a serial number on each blade.
Mine were bought in 1999 & the numbers are:
3225 XA-T & 3236 XA-T
I had the old hub bar & replaced it with the new style.
I will have to check the numbers on the blades. Thanks for the help and photos. I do have the older design hub bar. It has about 60 hours on it. I will just inspect it each time I am going to fly.