135mm El-Nikkor w/ 50mm threads...uggg (how do I mount this thing?)

[ic-racer]

Examples of the two different mounting systems, Turret and plate


I checked my stash of lens plates and I don't have any of the 50mm ones.

[Duolab123]

So after some research I ended up purchasing an El-Nikkor 135mm 5.6. To my surprise, the threads are much larger than M39. From the little info I found regarding this issue, I see that the lens originally came with an adapter to fit the 39mm threads. I've been unable to locate a replacement (any ideas?), so I'm thinking about purchasing a new lens board for my Omega d5500 which currently has a 3 lens turret.

So here's my question. If I purchase this lens board:
Lens Board

Can I mount one of these on there?
Lens Plate

Or do I need to purchase one of these?
Lens Plate

Obviously I'd like to get this done as cheaply as possible, I can pick up the first 2 items for under $50. Ideally, i could just find that old Nikkor adapter ring and call it a day, but I have no idea where to pick one up.

Any ideas?

I went through this with an old style, 150mm nikkor. The old scalloped aperture ring lens came with a 50 mm flange, Beseler sold a special board, pre drilled and tapped. Turned into a quest for the "grail" but I finally found the special board.
This stuff is going so cheap anymore you should find something on the eBay. I've found 150 el nikkor and Rodagon lenses for 50 bucks in perfect shape. I bet I have accumulated 35 enlarging lenses, everything I always wanted as a kid.
I am how do you say, Nuts! Good luck, Mike