How about Works Connection and ACD Racing skid plates? Works Connection is $125 at Rockymountainatv.com. No thickness given. Holes cut to drain oil without removing skid plate. Connection allows frame flex. http://worksconnection.com/details.php?id=856&modyear=&return=--WR450F ACD Racing is $110 on ebay. 4mm thick. http://www.ebay.com/itm/YAMAHA-WR450F-2012-2013-SKID-PLATE-ENGINE-GUARD-BRAND-ACD-RACING-PARTS-/161173196652?pt=Motorcycles_Parts_Accessories&fits=Model%3AWR450F&hash=item2586abcf6c#ht_2401wt_900 +1 Works Connection. I like the coverage from it.