Bolt / thread size front seat belt mount driveshaft tunnel

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Tim,

The thread size is 7/16-20 (NF). Not sure of the length, but the bolts have a large shoulder without threads and use a ring-shaped washer for the metal tab on the seatbelt to rotate freely after installation. I was going to use the seatbelt bolts for my loop, but the stock bolts are not long enough to add the loop on the bolt and still have enough to thread the nut on it to secure. So I ended up drilling thru the seatbelt reinforcement plate and using separate grade 8 bolts to secure the loop to the tunnel.
 

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Rich,

that's exactly what I will doing to my car too so your answer is perfect! Now that I know the original bolts are too short I will order some longer grade 8 yellow zinc bolts with the same thread and some self tapping nuts. If using two washers per bolt it would be not that much of a deal when using bolts without a unthreaded shoulder...

Thanks again!
 
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