All of the retro bodies such as the two McLarens, Lotus 79 and 93T, etc are all limited editions, so there hasn't been any official body sets released. Tamiya are doing the body moulding, front wing, rear wing end plates and stickers separately.
You can find all the part numbers here if you want to put it together yourself but if you just want a body, RCMart have them in stock, body, front wing but they don't have the stickers or wing endplates. If you want the full body set, RC Paintlab has put them together with the stickers here.
If you want Senna driving it though, you will need to find the Champions helmet decal set from AMS