Torsion bars 72 340 DUSTER
The 893 is the last three digits of the mopar part number. The other one will be one digit different. I have a listing by part number at home that I will post if no one else does and I think you can get the list from the mopar performance catalog on there web page, certainly you will find it if you search the web.
If your car is an original 340 car that has not been modified the bars should be 0.870" in diameter. The next smaller bar is 0.850" and the next larger is 0.890" so if you have a set of calipers you should be able to measure accurately enough to figure out what you have.