I forgot to fit mine before replacing the front half. But never mind, I used
the rear holes to mark the positions, cut a slot just bigger than the
thickness of the nut, welded a short strip of metal the same width as the nut
to the nut, fiddled that through the slot with a bolt inserted, and welded it
in place. You could replace the alloy spacer with a welded and tapped steel
spacer but I think the nuts are thicker than that, and anything else is going
to raise the seat.
Whilst drilling holes in the rear cross-member to aid the fixing of the
mounting rubbers is often mentioned, and through-bolts being used in the front
cross-member for these nuts, I've never heard anyone suggest drilling holes
just large enough to get a nut on a socket up to the floor pan. Seems the
most obvious solution to me now, with rubber bungs in the holes.
----- Original Message -----
The ones I bought several years ago did not have the captive nuts
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