mystery aftermarket 4 into 1 exhaust flange

Hi all,This forum was a great help to me when i built my kz 550 before maybe you guys can help me out again.

I picked up a 1978 kz650 for 400 bucks not running but the motor turns and has compression 22,000 original miles.The bike was left on an air force base back in 91.The stock exhaust was rotted with rust and unusable,so i found a 4 into one header with a supertrapp pipe on craigslist for 100 bucks.The issue is it does not have permanently attatched flanges like my other one from my 550 did and the stock collars will not work due to the ends are not not like the stock flared style.At the end of the pipes it has an inch or so bigger diamiter like it should have flanges attached.Is there a flange i can buy or i was thinking about cutting down my stock collars to fit?

You'll have to find a set of the factory exhaust collars and the eight "clamps".

Photos?

sorry i dont have camera or a smartphone worth a damn.After scouring ebay i found some shorter collars off a 81 kz650h they look alot shorter than my stock ones hopefully this is what i need.i'll check in when they come in the mail

The 650-CSR has welded-on header tips. see photo.

yes! its just like that,hpoefully my shorter collars will do the trick would that be the problem?exhaust is for a later year/model?