Hi K-Max,
thanks for the quick reply and the picture of the diff in its original packaging. That is a great reference for other fans of the MP5/MP6!
I had never heard of Kyosho Team parts up until now, and a quick google search didn't give many results. If you have any information about them it would be good to know. I will try to find out a bit more about them and will then add it to Wikipedia with a link to your thread. In the meantime I have added some information concerning other 3rd party suppliers in the optional parts section. More details and links to pictures including the Fioroni parts will follow as soon as I have time.
Thanks for correcting me concerning the radio-posts! IFW-56 were actually standard on the MP6 International

. I noticed both these and the engine mounts were missing in the comparison table on Wikipedia so I have added them.
Unfortunately I am not sure whether the IFW-102 will fit, but Lavigna might know, or perhaps there is someone in this forum with an MP7.5 who can measure them for you. The cheapest I could find was on ebay in France (link below). Shipping is pretty cheap so it might also be worth buying and re-selling if it doesn't fit. The only drawback would be that the even the MP6 International was still supplied with the BSW-54 as standard so it wouldn't be period correct anymore.
https://www.ebay.fr/itm/KYOSHO-IFW102-SP-Engine-Mount-MP7-5-/293328664672
Just in case you haven't seen them, here is link for some MP5 Decals. I bought the USA-1 decals from them, and they were very good, so unless you have to have the originals, this might be a good option.
https://mciracing.ca/products/1-8th-kyosho-inferno-mp5-decals