Periapt Cable on Senns

Maybe someone here can help me with this somewhat of an issue.
I have been gifted a Periapt cable for my Senn 650 and I’m trying to insert the connectors, but it seems like they are a little bigger than the OE. I don’t just want to jam it in there and risk damaging my cans, so any assistance is greatly appreciated.

Can you post a pic of the ends of the periapt cable and the oem cable?

Sorry for the late response, I’ve got them installed last night and enjoying music since.
The connectors that go in on both sides are a little snug and needed a bit of manly attention.

With the Fostex, the plugs only go in one direction.
You have to look at the surface of the plug to see if there is a groove or something and then push it into the counterpart.
It should take relatively little force.

That’s all it really is.