Getting the leather upholstery edge to stay in place on the Hard-Back Factory 993 Sport Seats

As our cars have aged the leather upholstery incrementally shrinks and becomes stiff. Also, the seatback leather has a rubber gripper-edging to hold the leather in place that becomes stiff and brittle losing its ability to grip. These items together seem to cause the seat edge leather to pull free from the seat's plastic hardback.

The immediate and simple fix is to:

--Soak the front and the back of the leather with Lexol leather conditioner to soften the leather and;
--Then buy some extra of the original metal hold-back clips part number 999.507.526.01 and add them to what are already there;

This will reduce the problem but did not eliminate it completely.

Alternatively, 

When I replaced my seat covers the new covers used a round cross-section rubber bead similar to the ones used on window screens that is force-fit into the cuff along the entire periphery of the seatback pinching the leather solidly in place. 

This type of attachment has been on my car for six years and

the leather has not slipped out. 

For this reason, getting some home window screen beading material at a DIY store and working it in up against the existing dried-out rubber gripper-edging will probably do the trick. I used a non-marring plastic scraper-chisel from Harbor freight or Amazon to install the beading on my replacement seat covers.

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