Hi Steve, can you be more specific about what seals you mean? Do you mean gasket type things around the outside of the turbo (e.g. manifold to turbo gasket, oil return line gasket) or seals inside the turbo's Compressor Housing Rotational Assembley? As far as I am aware, there is at least one difference in the 16T to 15G as the 16T uses the 'superback' flinger, not the 'flatback' flinger found on the 15G. I don't know if that affects the type of oil seal used though. Cheers, Pete