Looking for Sirine paperdoll/inventroy image

I've foudn that MSIR***.bam ar the files for the sirine avatar animation and I'm trying to asign them a /bam file to enable in image in the inventroy screen, similar to druid shapeshifts. I see ones for werewolves and mind flayers. I've tried copying a human fighter bam to MSIRINV.bam but it still doens't seem to be showing up in-games. Anyone have any experience in assigning inventory images to new polymorphs?

EDIT: And while we're at ti, is there a file ot table entry somewhere which links indexs from ANIMATE.ids to the *.BAM files they use??