In order to figure out if you have an HD 5 speed manual you can go to your driver side door and look at the certification label and if there's a C or W code that means you have the HD 5 speed manual
Do You Have Inside or Outside Lock Rings on Your Front Axle Joints?
The lock ring is important because it keeps the U-joint in place and keeps it from moving. If you have the wrong lock ring then the U-joint could rock back and forth and cause damage to the the yoke. If you have the outside lock ring it will have a circular shape with tangs and be at the top. If you have the inside lock ring then it'll look like a C and be at the bottom.