The standard seats are a little tight at the front anyway, when pushed
forwards, in fact the frame is tapered on the tunnel side to reduce the
interference. If your seats sides are parallel I can understand why it may
be tighter. The standard fixings should be fine in normal use, where the
floor pan is sound and the seatbelt-fixings are elsewhere on the body of the
car and *not* on the seat itself, I wouldn't have thought it took that much
loading. If competition regulations require a reinforcing plate *under* the
floorpan then that isn't a problem at the rear, however the standard front
points are concealed in the cross-member. You could weld a reinforcing
plate on top if that is acceptable, or use long bolts right through the
cross-member. However then you should really use spacer tubes to avoid
crushing either floor or cross-member, which would mean opening up the
cross-member, inserting the spacers, and closing it up again, possibly with
another re-reinforcing plate.
PaulH.
----- Original Message -----
> ... my first test indicates that they are a tight fit at the front
> against the tunnel.
>
> According to our regulations, "the attachment points shall be
> reinforced by the use of plates of not less than 75mm x 50mm x 3mm
> thick".
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