I haven't seen a mod that fixes this so I did it myself:
Fix the 6 incorrect models in the Most Wanted side missions that don't match their mugshots.
Although the wiki says that almost all the models in this side mission are wrong, only 6 out of 30 are. In GTA IV, the models have many variations in heads, skin tone, and props, which gives the impression that it's an incorrect model, but that's not the case; only these 6 are wrong.
With OpenIV put mostwanted.sco in pc/common/data/cdimages/scripts.img
Rodrigo Stavnes: the game previously used a model of a Jamaican gang member when it should be this pedestrian:
Bert Reker: no longer uses the fat biker model of the AOD:
For Noel Katsuda the game used Phil Becerra's model and Phil used Noel's:
Glenn Lushbaugh used a biker model; I've fixed it, and so has his associate, who will also be Jamaican.
Mervin Eskuchen previously used the model of an asian pedestrian: