Help identify these headers please

[DrLivingston]

I figure I can appeal to the most Bimmerheads here so perhaps you guys can shed light on these headers. I have googled and can't find a thing but here's what I have. Headers bought off a BMWCCA member years ago under the impression these fit my s50. I have not mated them up yet, but the biggest thing throwing me is the single out of 3" and most headers for this car show a dual outlet. Do they look to be the accurate size/shape/bend? They also have two 02 sensor bungs welded in on the last collector where I believe factory ones go. There are welded tags on the headers stating these numbers:
The last collector to the 3" out has :99153
the two pieces of headers have :99152

They were also ceramic coated.

Thanks in advance!
http://i661.photobucket.com/albums/uu339/JeffreyThomasMedia/IMG-20120206-00630.jpg
http://i661.photobucket.com/albums/uu339/JeffreyThomasMedia/IMG-20120206-00631.jpg
http://i661.photobucket.com/albums/uu339/JeffreyThomasMedia/IMG-20120206-00632.jpg

[BMWMPow3r]

well the factory obd1 e36 6 engine's midpipe merges into a single right before the o2 sensor. the flanges look like they are for a m/s 50 or 52 variant.

[Tipsy]

kinda looks like the racing dynamic headers? or ebay copy of them?

[DrLivingston]

Will these bolt up for a s50-s52 possibly by looking at them? What I mean by that is, with these on going to a single 3" out..what center section could be used because any factory or aftermarket uses dual inlets if I'm not mistaken.

[breakfast]

those are nice collectors.

looks like a supersprint copy(like most ebay headers) but its definitely done nicer. but then it goes down to a single..pipe. hrmmm

it will fit your car imo based on those pics. there is a little plaque on the longest primary tube. what does it say?