I bet you could use a ZX2 lower timing pulley. Its roughly the same size. If you buy any Zetec timing kit it comes with one, but is not used in the Focus.
04 ZX3 Mostly Stock ["Best Non-SVT" FITF '12][3/13 ROTM][7/14 ROTM][2014 ROTY]
12 SE Hatch Sport & Winter Package, ST Front End
94 F150 XLT 5.0 HO, OBDII Swap
89 Bronco II XLT Crawler