I changed my rear spring plate bushings on my 67 911S and ordered bushings going by the Weltmeister catlog in pelican parts and got inner bushings that do not fit properly I checked my factory book page SR31 shows 911S with chassis # past 305 101 S use the 69-76 inner bushing ( which is the same outer bushing from 65-89). So if you have a 67-68S you can order Neatrix bushings or any bushing that fits the 69-76 911 cars. Once again only non S 911 cars used the little inner bushing from 65-68. I hope this saves some one else time , Fritz