Which "Center Support Bearing" for "early model" E30 w/ M54 swap? (two options)

[Dave325esE30S54]

Which "Center Support Bearing" for "early model" E30 w/ M54 swap? (two options)

Hey everyone, I am trying to figure out which CSB to use for my swap into my 10/86 325es that is getting an M54B30 w/ ZHP 6spd.

The E30 changed its DriveShaft in late 87, and the CSB along with it, so there are two CSB options, an early and a late model, but I don't know if the CSB corresponds to the early/late BODY or the early/late DS. I am half guessing the body/mount-point did not change, and it corresponds to the DS change, so that would mean I want the late model CSB to work with the E36 DS, but that is just a guess.

I already figured out the front section from a Z4 M/S54 6spd Manual and the rear section from an E36 M3 Automatic (or a number of E36 Automatics), but I am struggling to find clarity on which E30 CSB to use. If I was putting this into an 88+, this would be no problem, because I would use a "late model" CSB, but everywhere I look everyone just says "use an E30 CSB", not which combo of early/late, etc...

Help/Guidance with this would be greatly appreciated!

[ZeroDarkE30]

With a 10/86 production date which is a month earlier than mine you would need 26121225152 but since you are changing the rear half of the drive shaft to an e36 M3 drive shaft (i think but your post is confusing me) you will probably need what ever CSB is for the e36 M3 that the rear shaft is from. If the mounting holes don't match up you may have to put some studs in the tub. I would think that the CSB prescribed for your car from the factory wont fit around the shaft from a different car but you would have to look at the OD of the shafts and even then not sure how it would affect balancing if at all.