Part Number Cross Check?

[cicsprog]

I have a line on a tonneau for my 1988 CAB. Guy that has one from his father's car thinks it was a 1985 911. Does Porsche put the part number on these things?

I checked part #s for 1985 vs 1988 911 CAB. They are different (1985 911.561.923.00 versus 1988 911.561.089.60).

Anyone know if this tonneau is the same and would fit my car? I know Porsche can sometimes change part numbers for the same part. Thanks!

Jason 1988 911