Best bet for steel is the Soma website. http://www.somafab.com/parts/forks
Also Rivendell http://www.rivbike.com/product-p/carbonomas.htm
For (mostly) carbon, nashbar/Winwood.
Richey: http://www.benscycle.net/index.php?main_page=product_info&cPath=2083_127&products_id=2632
WoundUp http://www.woundupcomposites.com/road_fork.html
No clue on the SunLite dimensions.