How many are needed to do a whole 71 240z?

I bought 5 bags of 10 so I would have some spares left over. I tried to count them several times and came up with different numbers each time, it was between 34 & 38, just got 50 to be safe. They are small, light & cheap to have spares.

Bonzi Lon

Thanks!

I used something over 40 to do a 280Z, lots more of these things than I realized.

What is the actual hole diameter(in mm) for the pin-clips?