Steering column cover

[72BLAZERDUDE]

I recently changed the instrument panel in my 78 Blazer because I added aftermarket guages, Not sure what year the new one came out of but the lower steering column cover that came out of my 78 wont fit. It is about a half inch to long. The new instrument panel needs one that is slightly less than 9 inches long. The one that came out of my 78 is 9 1/2 inches long. Tried to buy one off of ebay but the guy insisted I was nuts and they are all the same. Does anyone how many different versions there are of theseand what year fits what.