2004 Dodge Ram 3500 - Elbow deep in this engine and I need help

The front main shaft oil seal kit I purchase has 5 parts. The wear sleeve, the plastic centering sleeve, the seal, the depth gauge, and what appears to be a rubber oil slinger.
When I took this apart, there was a ring on the outside of the cover and it just fell out when I removed the harmonic balancer. My question is, do I put this rubber ring on before or after I put the cover on (with seal installed)?

I don’t know but others may want to know which engine the seal kit goes on.

I found out
kit has two parts

  1. Install components

  2. Tools

  3. Install components

Dust Cover
Wear Sleeve

  1. Tools
    Plastic centering gage
    Metal depth gage