Impact Bumper Support Washer

[frankc]

Ok, I know this is a bit obscure, but does anyone know the details of the washer used to fasten the impact bumper shock/crush tube to the chassis? PET states that for 1977+ the part number is 900-025-099-02, but I ordered that part and it is simply a thick round washer. The original washers on my 77 (and I've seen on other cars) were large rectangular washers.

The picture below shows the difference. Was the part superseded at some point to be a conventional round washer. It seems the larger surface area of the original rectangular part would be an advantage in this application. But the later style is lighter .

Does anyone know of a part number for the rectangular part?

Thanks

[tmadden2]

That rectangular washer looks exactly like the shims on my engine bay hinges. I don't know the part number at the moment, but you could see if they're the same thing.


Sent from my iPhone using Tapatalk

[javadog]

Porsche probably superceded the number. You don't actually need the thicker one in that application, I have no idea why they used it. It's not a tight joint, there's no real risk if the nut loosening and there's no force on it if you actually use the bumper by hitting something.

JR

[frankc]

Originally Posted by javadog

there's no force on it if you actually use the bumper by hitting something.JR

Yes, my thoughts exactly, so I was not sure why such a robust part was used - unless the intent was to provide a better distribution of force if the bumper were to be hit from the opposite direction (i.e.; side-swiping something and the end of the rear bumper takes the impact, ripping the bumper off the car). But even then, I would think that it would be better to allow the fastener to yield than attempt to keep everything together. Who knows, it may have been some part of the federal mandate.

Oh well, not a big deal - just curious. I may have the old washers re-plated the next time I drop off a batch of parts at the plater, just so I have them in case I decide to go that route.