I'm going to look at an Omega D5-XL enlarger tomorrow morning. It is offered without lenses which is OK by me, but it doesn't have lens boards or turret mount. I've checked the Omega site for lens boards and they only acknowledge there is such a thing. They offer no explanation to size or part #. I cannot find info on the turret mount.
you might give a place in boston a call - ep levines.
you can find then online (cameras.com) ...
or pittsburgh camera exchange might have something like that too ..
they *might* have what you are looking for.
can't promise anything though
harry taylor (classic enlargers) is pretty much your best bet ..
I'll second all the comments made about KHB. I found parts for my Omega D2 quite easily through them. Just brace yourself for the price.
They are very helpful and friendly though, and advice or referrals are free.
you know, i forgot all about them, and even though i have never used them, i would also give them a recommendation. i was on the verge of having them fabricate a lensboard for an e4 - but then i was able to find one for sale that i bought instead. they seem like a "top-shelf" outfit and i have only heard good things about them.