Tamiya has a Driver and mechanic figure for that MP4/5B. I'm sure the driver will fit into the MP4/4. It comes with decals for Senna and Berger. I guess you would use the Senna ones as the MP4/4 was driven by Senna/Prost if my memory serves me right. Coicidentally the MP4/5 was my very first model ever. It doesn't look too good because of my inexperience. I will be stripping the paint one day and refinishing it. This time I will go with the two tone colour as the decals aren't the best for that. Post some pics when you are done!