I have a Clark's but I didn't think the fit was all that great. The wso fit much better than the Clark's if that helps. Pm me and I will send the Clark's to you if you want it.
Don't worry about the gen. The quality is much better than anything you will find on a rep or even aftermarket. Wso on eBay sells a cheap aftermarket 116 but they are not very durable. Get one of the cheap ones to test the fit and if the case fits the gen spec crystal then get one of the sapphire ones from them.
Any issues fitting the gen insert in the Clark's bezel? I bought one of his assemblies and want to use a gen insert but don't want to spend the money on one if it won't fit.
28mm (gen spec) for the 1016 dial all the way. I don't know why ingod does it but they list all their dials at 26.5mm but they all very in size depending on the ref.
I assume your talking about a 1665? Yuki has one but they are out of stock at the moment but I would email them to see if they have more coming in. You could also try wholesaleoutlet on eBay.
For the Yuki case they say to allow 25 days for lead time on the case so I'm sure that they have them made to order. Out of all the high end rep cases Yuki is the most affordable and I think it is a better case than the ingod44 case set.