WTD - 90mm Road Stem - Standard Bars (Not OS)

Its not the 90mm stem thats hard to find, but in that size clamp is. Why not just get a 31.8 with a shim to fit?

Something like this

http://www.evanscycles.com/products/race-face/ride-2012-stem-ec035466

http://www.evanscycles.com/products/race-face/evolve-xc-stem-os-ec020508

Oval do them, the R700 is a top stem with reverse bolt clamping,

http://www.cyclingbargains.com/product_info.php/oval-r700-standard-stem-...