Want to Buy WTB: Lens Plate for. Nikon 50mm lens for Durst. M605

Hello,

I'm looking for a lens plate to use a Nikon 50mm f2,8 lens on my Durst M605. It shouldn't be the flat one but a (I don't know how to call it in English) cap shaped one?

If you have one laying around it would be great! Trying to make my dad happy who's currently building up his darkroom with my (unfortunately no longer complete) M605 enlarger. Thanks!

-Indra

If I'm correct it's a recessed lens board which is calles Siriotub...