Looking at the Roblox packages (the original ones, not Rthro) when in R6 provide CharacterMeshes, which editing the ID’s within them can be used to change the meshes and textures. However with R15 these are no where to be seen. How can I go about adding my own meshes to a player? Or even adding a normal roblox package to an R15 character?
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I think you’re looking for this. 
https://developer.roblox.com/api-reference/function/Humanoid/ReplaceBodyPartR15
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There’s several functions you have at your disposal if you’re interested in R15 body parts.
https://developer.roblox.com/api-reference/function/AssetService/GetAssetIdsForPackage *
https://developer.roblox.com/api-reference/function/AssetService/GetBundleDetailsAsync
https://developer.roblox.com/api-reference/function/Humanoid/BuildRigFromAttachments
https://developer.roblox.com/api-reference/function/Humanoid/GetBodyPartR15
https://developer.roblox.com/api-reference/function/Humanoid/GetLimb
https://developer.roblox.com/api-reference/function/Humanoid/ReplaceBodyPartR15
https://developer.roblox.com/api-reference/function/Humanoid/ChangeState
Essentially: Humanoid API, as well as AssetService.
*I believe that the callback starred was superseded by the one below it.
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