can someone tell me how is possible to fix that, there is many guides for final gracia what i found but for interlude nothing special to guide me. is something what can be fixed from lineagemonster.int or npcgrp.dat ? or need to open ukx ?

IIRC it was related to the names of the bones? you need to do some work in 3ds max to rename / add a bone with the proper name

i don't exactly remember the name of the bone unfortunately, you should check the strider's bones as reference to see where the character sits

or maybe it was a mesh socket issue, my advice: delete interlude, embrace new clients XD

i solve that problem. i fix new dll for set position for rider in new ini 

if you set bone position then rider site on the bone, if not find a bone or you let it null the you can use xyz to control the preset client native is this one..

 rider+0x214 bit 0 = bHardAttachrider+0x218 = HardRelMatrix (64 bytes) translation:X = rider+0x248Y = rider+0x24CZ = rider+0x250 

and here is the results