[TR] VIN stamping

[Randall]

> I thought they were aluminum rivets.  I used pop rivets (so did
> Standard Triumph on my TR4) if you're fussy you could fill the hole
> with a bit of JBWeld for a more accurate look.

Originals on a TR3 were aluminum rivets with a separate shaft in the center
which ISTR was steel.  Not quite a pop-rivet, but close.  I'll bet you could
save the center piece and drive it into a pop-rivet and no one could tell
the difference.

-- Randall