I'm looking for any information on conning towers for IX type uboats. I've gone through many documents/books, but unable to find the same detailed description as for type VIIs. The only mention on the subject I've been able to locate mentions that the look of type VII and type IX became "more similar when both uboats received a Turm 4 type upgrade".

I'm working on some models (or starting to) for SH5 and really would appreciate any information that I can get my hands on in this regard.

Thank you in advance.