Have a set coming for the rear. These are extremely high quality stamped steel, same as the NB2 OEM ones really albeit extended by 20mm.
https://i.imgur.com/thoeb8X.jpg
Price is kinda awesome too, and shipping rates are quite reasonable.
http://www.maruhamotors.co.jp/parts/highstrokeupper.php
Plus Maruha is awesome to deal with! :)