Rebuilding your shift linkage? Here is the soft parts list to consider replacing including hard to identify part numbers.

Over time, the 993 shift linkage can develop play with use. Most of the play comes from assorted plastic bushings or the plastic ball cup socket at the bottom end of the shift lever, all costing just a few dollars. One source of poor shifter feel may be the rubber coupler at the end of the shift rod, further back, where the mechanism attaches to the transmission's internal shift rod.

Here is a comprehensive list of shift linkage soft parts subject to wear that can be considered for replacement when the transmission or clutch is being serviced:
 

  Qty  Description           Part number        Notes

4    Insert                     964 424 115 01    To mount Shift Slide

2    Bearing Sleeve     964 424 028 00    To mount Shift Pipe

   

6    Plain Bearing        999 924 002 40    To mount Shift Fork & Shift Rod

    

1    Rubber Washer     950 424 227 02    Links Shift Rod to Transmission

    

 

1    Angular Joint        928 424 005 01     Links Guide tube to Bearing Plate

Alt    Nylon Angular Joint  Cup 928 116 145 03 

URO offers it as an aftermarket part. Some have had good results  using this as an alternative to replacing the Angular Joint above.

   

1    Cup Bushing         911 424 139 01     Links Guide Tube to Shift Lever 
 

1    Tubular Rivet*       900 120 046 0C    To mount Rubber Washer, 

                                                                    See part 16C in the diagram below

    

    * This part may be able to be substituted by a generic screw, washers & locknut similar to that used with the J West aftermarket Rubber Washer below.

In the 993 catalog, the rubber coupler is not called out as a separate part number but if one reaches back to the catalog for a late '80s Carrera, this is what one finds:

Not only is the rubber part listed (16A) but all the hardware bits to install it!

Also, there is an aftermarket upgrade part  available from JWest Engineering:

The  Golden Rod and other aftermarket solid shift linkages.

Transmission end Linkage
FDM Golden  Rod

The FDM Golden Rod is based on the factory RS and RSR solid-shift linkage design. Some believe aggressive shifting with solid shift linkages can cause the shifting process to apply too much force to the transmission internals when changing gears. The rubber washer in the stock shifter linkage prevents hard loads from being transferred from aggressive shifting. Some speculate this issue only applies in track-driven cars, as thousands of street-driven cars have had these linkages installed, racking up tens of thousands of miles without issue.

Here is a page that discusses the clutch and its role in shifting issues.

Here is a page that discusses related transmission issues.

Failed Angular Joint
Ball Cup

Here is a page that discusses related flywheel issues.

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#993 Shift Linkage #Shift Coupler #Shift Linkage #Shift Rod Coupler #Rubber Washer 

#Rubber Coupler #993 Shift Linkage #993 #Golden Rod