Sill Plate/Threshold Installation

[pacarguy]

This may seem like a dumb question, but I am having trouble installing new thresholds on my car. My car had some really beat up pieces but the PO gave me some nice new ones as part of the spare parts with the car. The hardware that came with them has small screws and plastic rivets. Since the old ones were only screwed on, I can't figure out where the rivets are used. I looked in the repair manual, but there is not instruction or illustration. Can anyone help?

Thanks

[jameshtaylor]

My 73 and 74 are both screwed in place, no rivets.

[Richard]

On an early car you want to use the screws to attach the sill plates. The plastic rivets are for later cars. My '67S has screws attaching the sill plates. My '73S has plastic rivets. I think both are original depending on the year.
Rich

[69S-S/R]

The white plastic, "drive rivets" as they are called, were used in the late 60's through the early 70's sill plates, 911, 912 and 914. Perhaps some owners of original cars can help establish exactly which years. The rivets were one of Porsches great ideas which worked originally but are almost impossible to install on new plates. If authenticity is not an issue use sheet metal screws, probably 2.5 or 2.9 X 9.5 pan or oval head. If, on the other hand, you do care, then you have no choice but to use the plastic rivets which are available from Stoddard, #999-591-550-40, order 25 for the learning curve.
The idea is to insert a rivet into the hole in the sill plate and then into the body metal, tap the post of the rivet which will be driven into the rivet and expand the inside part, thus securing the plate. My experience has been when attempting to drive the post in it breaks off! The only solution I have come up with is to carefully break off the post, sharpen one end using a Dremel tool with a cut-off wheel, then drill out the center of the rivet, 2.0m or slightly smaller, and re-insert the post into the hole and tap the post into the rivet. Since the rivets are not very tight you may want to glue the sill plates to the threshold to keep them securely in place, the rivets are primarily for show. If there are other ideas out there please chime in. I am only one lonely "sole" just trying to satisfy concours judges.
Dr. Rivets

[WCB4]

I know that my late 73 CIS car used the plastic rivets from the factory.

[BOYER73S]

I have had similar experiences installing new rivets.

if your sill plates are not NOS and are repro's the holes will not exactly match up and your job is impossible and you don't want to make the holes in the car bigger as then the rivets fall out