chasis rail thre holes at the rear are they threaded ?

anothe post asking about towing has prompted me to remember to ask .......

i have a towbar to fit , the bar has end plates that apparently fit the three holes found on the outside of the chasis rail at the rear . i have the holes in the rear on the outside of the chasis rail , mine dont appear to be threads or have captired nuts .
IS there somthing wrong , should the 3 holes be on both sides of the box section , or should i have captured bolt or whatever should i have ?

 

Yes it should have captive nuts, M10.
To be pedantic, two in the chassis and one in the valance.

 

Do you mean the plates stand upright, So you would have 6 bolts on each side ?

 

You read it properly.

 

The captive nuts maybe corroded....

all 12 of em....

 

thisis the end plate of the towbar but i dont have a pic of the chasis

 

this is the whole tow bar . only 3 of the holes line up with holes in the chasis rail
my van is a 1973 model

 

the holes i have are vertical on the chasis, not horizontal as zeds pictures holding the bumper brackets

 

That looks like it needs through bolts and anti crush spacer tubes so you do not crush the chassis rails as you do it up.

 

If your bolting through the side of the chassis then theres holes cut out on the inner side so you can get a nut and washer on

 

only on late late bays... A 73 wouldn't have those

 

That also means it won't have 3washers and two nuts in the chassis rails then
I'm ashamed of myself for losing them