Thanks Bob, but I yanked a couple of good ones from a parts car.
After looking things over more carefully, I realized that there is no snubber, because there is no place to put one. The inserts were heavy duty Bilsteins. The shaft broadens out to 95% of the full insert size right below where the dust cover sits. I looked up the part number, and it is listed under both 914 and 68-72 911.
BTW: Don't tell anybody, but the inserts I used were "Gabriel Premuim Gas" struts I picked up at the FLAPS about 4 years ago when I found them on a clearance table marked down from $249.00 to $49.00. They were the only struts on the table, and when I saw they were for a 914, I figured it was fate for me to find them, so I bought them even thought I didn't need them. I know they are not from the motherland, but they ride great.