Изменил запрос. Однако по прежнему результат 404.

GET /shop/model.0/part-search/default.asp?mxcd-partn=99404960&mxcd-para=1&mxcd-bpart.x=1&mxcd-bpart.y=1 HTTP/1.0
User-Agent: Mozilla/5.0 (X11; U; Linux i686; ru; rv:1.9.0.8) Gecko/2009033100 Ubuntu/9.04 (jaunty) Firefox/3.0.8
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: ru,en-us;q=0.7,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: windows-1251,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Proxy-Connection: keep-alive
Referer: http://motorzona.ru/Default.asp
Cookie: emotor%2Dcookes=SURL=%2Fdefault%2Easp%3Fcmd%3D0020 0600000000000110000000000000000&UID=%7BE82A4EC9%2D B6EA%2D4F4E%2DA8D4%2DEECC99052435%7D&currency=rub; ASPSESSIONIDAATDBCTT=LNHCKKGDLGOLAAKANIOIOANE; b=b;