Rocketbrian

I know this is mission in possible but in the anticipation of redoing alot of my Sienna interior during the winter, I am looking for a full set of Sienna seatbelts, which were only offered in 71. I want to upgrade from the basic looking black belts to the colored belts with the stainless buckles. My SX has bucket seats so I need a full set of belts including the shoulder set up for this configuration.
Thanks.