Turbo IP has the fuel boost compensator mounted to the top of the IP. Actually, isn't it an entirely different top cover assembly with the compensator built-in to it? It is the saucer-shaped device on the top of the IP, referred to as the "LDA.".
Sorry I have no time right now to search some links for you but you probably can-- try search Bosch VE IP LDA or similar.
Oh, here you go
http://www.4crawler.com/Diesel/SAE/figure_13.jpg
Rebuild what? Engine? IP?