Difference between coupe rear shelf in '71/'72/'73?

[911scfanatic]

p. 64 of the 911 Restorer's Guide to Authenticity says there's a difference (within coupes). What is it? Anyone have pics illustrating the difference? Pics of a '72 coupe is shown on p. 62. Thanks.
(Also is there anyplace that has nice period correct, pre-'74 repros?)

[70SATMan]

The grain of the vinyl changed from 71 to 72-73. Other changes I don't know.

[Zeke]

Beginning in '72, the seaparate strip across the top edge of the "parcel tray" became one with the whole piece and was all cardboard. The <'71 piece is metal and screws down with four screws into raised tab-like brackets that also are not on the '72>.

[911scfanatic]

Ah, I see. So, are '72 and '73 the same? My '72 shelf wasn't in as good of condition as I liked so I sold it. I imagine most of them out there are warped. Does any one have a repro from a place like Auto's?