Found these ones on element14 that should work.
1W 20ohm 5%
2W 20ohm 1%
http://nz.element14.com/vishay-dale/cpf220k000fke14/resistor-metal-film-20kohm-2w/dp/1343389
Putting 2 resistors in series will double the ohms and 2 in parallel will half the ohm rating.
