This is probably a stupid question but have you looked at the Ford Contour and the Lincoln mark 8 fans? Its a two speed fan and pull about 4200 CFM if I remember correctly. I don't know for sure if it does but I remember someone telling me not too long ago that the Lincoln would fit. They're usually not more then $30-40 in the salvage yards.

Edward

'97 Montero Sport LS 5-Speed 3.5L conversion
SAS Dana 44s & ARBs, 35" Yoko Geolandar M/Ts
NP231 B4R doubler/Terra Low231/RP 5.38 229:1
'99 Montero Sport Limited 4WD SAS 3-link project
'03 Montero Sport Limited AWD
'97 Montero Sport LS 5-Speed 4WD