According to info AT sent me a while back the following stylii are compatible (not including eclipital and lower quality) with the AT440mla (and mlb) cartridges:
VMN60SLC (special line contact)
VMN50SH (shibata)
VMN40ML (microline)
VMN60SLC (special line contact)
VMN50SH (shibata)
VMN40ML (microline)