Hey iani,
there is a s4m_ur4i_8x8_2d_soulslike_gothic_tileset.tmx (tiled) it uses an 8x8 grid, which makes it posible to use 8x8 and 16x16 for the level building. So if you are using something like unity, the slice by grid size setting would be 8x8 and you are good to go.
If this doesn't solve what you are looking for, please write back :)
- Sam