Need Compatibility matrix for WID , IBM BPM (Integration Designer) / RTC & WESB

Hello,
We are planning on Upgrading to RTC 4.0

Need some help with compatibility.

Which/What is the compatible version of IBM BPM  (Integration Designer) & WESB do we need to integrate with RTC 4.0.0.1?

(Different combinations of RTC 4.0.0.1, BPM & WESB)
Will  Integration Designer 7.5 work with RTC 4.0.0.1 or does it have to be 8.0?
How about WESB?
If RTC 4.0 works with Integration Designer 7.5  is that compatible* with WESB 7.0?
If RTC 4.0 needs Integration Designer 7.5  is that compatible* with WESB 8.0?
If RTC 4.0 needs Integration Designer 8.0  is that compatible* with WESB 7.5?
If RTC 4.0 needs Integration Designer 8.0  is that compatible* with WESB 7.0?
 (* means compatible and supported by IBM)

Is there a compatibility matrix I could refer to that would tell me
I am looking for something like below

Example
RTC 2.x  --> WID 7.0  -> WESB 7.0
RTC 3.x --> BPM / WID 7.5  --> WESB 7.5
RTC 4.x --> BPM/ WID X.X  --> WESB X.X

Thanks
RK