Is the blitz nur spec a 4 for exhaust bung?

[iamlegend]

Found some decent exhaust bungs the ones on eBay but need to kno what fits the blitz nur spec tip??

Any ideas?

4?

 

[Gerrit]

I've got here a unused original BLITZ one with the following sizes: 'long pipe' 60,5mm, 'end pipe' 110mm