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I always thought they were filled with rubber or the like to meet the US mandated 5 mph impact test? Are they completely hollow?

http://www.panterapartsusa.com...l.cgi?prod_id=23007B

Later euro cars that had no need to be loaded up with over regulated parts had a simple bracket, thus;
http://www.panterapartsusa.com...l.cgi?prod_id=23007C

Julian
Mike, I got curious about them myself. So since I'd made a set of lightweight aluminum tube supports to replace the shocks for fiberglas L bumpers, I sawed one apart a few years ago.
They are real hydraulic dampers made by Fichtel & Sachs, a well known European damper manufacturer, with oil inside and a stack of deflectable damper washers. While they were apparently designed to work more than once under light impacts (those are 2-mph bumpers!) a sharp enough blow seems to fail the seal and let shock oil leak out. After that, you have an easily moveable bumper mount with about 1" of travel. They are not rebuildable. I wrote a small article a few years back, with photos, in the POCA Newsletter.

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