here's the reply i got from ssd4u.com tech staff
The contour kit uses 4 bolts to fasten the adapter to
the mass airflow sensor housing.
Size: 1/4" x 20 x 1 1/2" with a nylon insert nut
Type: Grade 5 Plated
Use two washers with each bolt so that a washer is on
the MAS housing and the adapter housing.
Sincrely,
Bill
SSD-Tech
