[Spits] Warning light lens

[mkcaspian1 at aol.com]

 Hello - My 1978 Spitfire is in the final stages of reconstruction and I am
missing one part - it is one of the 2 warning light lens, black rectangle with
red lettering, 3 holes, one large in the center and 2 small on each side.
They go in the center section of the dash.  I have one that says "Brake"  If I
remember correctly, the other one says "Seat Belts"  Is that correct?  If so,
does anyone have an idea where I can get a replacement?

John