Exhaust gasket 1.9 wbx - dimensions?

[T25Convert]

Hello all,

I fitted a new stainless exhaust with the gaskets it came with, but they were, on balance, a bit rubbish.  The ones on #1 and #3 failed, but they were easy to get to, as it was just a case of removing the 'j tubes'.

Now #4 has gone as well, but to get to it is a major headache. With old air-cooled engines I've had I used copper gaskets that were slotted, so you could slip them in - like these: 

https://www.machine7.com/search.php?xSearch=copper+slip&submit=Search

No one lists them for the T25, but was wondering if the head studs are the same dimensions as a Type 1 head, and what diameter the port itself is? 

Anyone know? 

Cheers!

[maxstu]

DG cylinder head exhaust ports are 35mm.
From my experience messing with early style exhausts some use a mixture of studs and bolts. So l guess No4 is fitted with studs and nuts?
Either buy some WBX gaskets and cut out two edges. Or remove the silencer again and fit unmolested exhaust gaskets.
Or take a gamble with 35mm versions?