This is the rubber seal for all DS / ID saloon models with aluminium roof panels and models with fibreglass roof panels made prior to July 1972. L=4360mm

If you are unsure whether your roof panel id the earlier bolted type that this rubber is for, or the later bonded roof, have a look under the edge of the roof frame just by the top of the door glass when it is wound up and if you have the bolted type roof there should be bolt heads visible along each side of the car. 2 above the front door glass and 3 above the rear door glass. If you have the later (post July 1972) bonded type roof some of those bolts will be replaced with rubber plugs instead. You cannot go off the date the car was made as the change to bonded roof panels was phased in from July 1972, rather than implemented across the board at that date.