E30 320i m20b20 belts question

Well Lads,

Happy new year to ye!

The father has asked me to price a few bits to finish off his 320i loon. Handy enough, but as I'm generally an e36 fella myself I'm having an issue with finding the part numbers for the two fan belts for her?

I've been looking on Realoem and have the alt belt part number 11511706710

The only other part number for a belt I can see is 11311711081 which would appear to be a timing belt ie not what I need?

Anyone any help please!?

Thanks!