Need Help IDing a 4 into 1

[crazyramen]

Howdy y'all I just bought this 4 into 2 into 1 header thinking I got a good deal for ~$100 shipped, but it's not fitting on my '79 750. The flanges have too tight of a bolt spacing, and the top of the collector where 1 and 2 connect hits the oil filter cover. The outlet would also run into the center stand with a muffler attached, but I assume a lot of racing oriented pipes are like that.

I've taken some measurements and I'm thinking this might've been attached to a cylinder head from a smaller displacement model and wanna see if any of you smart folks can help me figure it out - hopefully I can get it to somebody that can use it.

Here's the original listing: https://www.ebay.com/itm/136843452212
There is a model number stamped into the collector SU768SSH 8-99, but nothing came up in a google search for it.

The cylinder head it came off of is painted black, but I can't tell if that's original: https://www.ebay.com/itm/13684623937...102726.m162918

Pics of it "installed" on my '79 GS750: https://imgur.com/a/ebay-4-into-1-NUK0DCE

Here are the measurements I took:

	OEM 1979 GS750	Ebay 4into1
Flange into cylinder head	OD - 45mm ID - 32mm Depth - 19.5mm	OD - 41.5mm ID - 35.5mm Depth - 16mm
Mounting Clamp Hole Spacing (center to center)	60.5mm	57.5mm
Pipe OD	39mm	39mm
Mounting Bolt Hole	8mm	8mm

The output pipe diameter is 50.5mm/1.98in

Any insight is greatly appreciated

[first timer]

it's likely for a oil or liquid cooled gsxr 1988+

[crazyramen]

it's likely for a oil or liquid cooled gsxr 1988+

The thing that really throws me off is that the head they pulled it from is an 8 valve

[first timer]

The thing that really throws me off is that the head they pulled it from is an 8 valve

Do you have a picture of that?

[crazyramen]

Here's one of the pics from the ebay listing

https://www.ebay.com/itm/13684623937...102726.m162918