The studs that Jeff is refering to can be had from Toyota along with all the other goodies(dowels, cones, flats). They come on the 100 series. Maybe Christo will speak up. Did we not do this on some one truck many years ago.
I had Dan look at the gaskets and see if they will swap, they will not directly swap leading him to believe that the hubs maybe slightly bigger on the 100 or 105 in the rest of the world.
Anyhow the drive flanges would need to be re worked to hold the bigger cone washer. I was thinking that maybe the drive flange would fit, but again Dan did not think this would work because of the way the bolt pattern was(both flange gaskets had 6 holes). Anyhow this upgrade if you bought both flanges and studs, cones, washer, nuts would set you back about 170.00. A lot less if you were just buying studs, washers, cone washers, nuts.
Not to bad if you could make it work.