Suburban dealer-installed rear shoulder belts

[Maynard]

I have a 1984 K2500. Second row shoulder belts were a dealer installed option, and I don't know what years that option was available. If you've ever had the interior trim off a vehicle which had the option available, you've seen the anchor points there.

I have single retractor lap belts only on the second row seats. I want to put double retractor shoulder belts in their place in the outboard positions. I bought a set of front seat double retractor belts without considering the space requirement. I don't think they'll fit with the seats up and they definitely won't fit with the seats down.

Does anybody have a rig that has had the second row shoulder belts installed and can you post or send a picture of that installation?

Others, have you installed second and/or third row shoulder belts and how did you do it? Pictures?

Thanks.