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Five points are fine. Without attaching anything, layout the harness with you in the seat to check the lengths you'll need.
Drill a hole through the floor which is clear of the X-member and under the approximate middle of you seat. Get a grade 8 bolt as big as the hole in the belt mounting tab (usually about 1/2"), and a 4" square, 1/8" thick steel flat gusset plate. Drill same as floor. Use grade 8 nut and washer. Install the bolt with the head 'up'. Install with gusset under floor and space the tab off the floor with a washer. Through bolt the assembly.
Don't attach the belt to the seat frame.
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Chas.
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