Thanks for the post. I just did this... took about 15 - 20 min. I am 5'-8" so not the tallest mofo but I do like sitting up high. I went online to the bolt depot and bought my stuff, worked perfect thanks the specs kenchan had posted.
I bought two zinc plated class 10.9 steel 10mm x 1.25mm x 50mm bolts @ .89 cents each
https://www.boltdepot.com/Metric_hex..._x_1.25mm.aspx
And two zinc plated steel spacers 3/8" x 1" (3/4" O.D.) @ $2.21
https://www.boltdepot.com/Spacers_Zi...steel_3_8.aspx
I did not buy any washers because I thought I could re-use the existing ones but nissan used some kind of black magic spell and they are forever stuck on the stock bolts.... so I suggest buying some washers while your at it. The bolts from bolt depot are large enough they will not slide through your seat bracket hole but a washer would just give the hole thing more strength.