I bought the CL-7 and the CL-8 to build respectively a 9'6wt and a 9'9wt.
I encountered different problems with these reel seats:
1- CL-8 doesn't hold well the new reel foot of my old Florida reel #55
2- CL-7 do really hold well the new reel foot of my old Florida reel #55
3- CL-7 and CL-8: fighting butt inserts are too large to fit into the reel seat. You have to turn with a lathe the external part of the insert and decrease the diameter. That way, it will fits into the reel seat.
4- CL-7: no cork grip suitable for that reel seat. You have to do your own inletted cork grip. or modified a non inletted one.
5- CL-7 and CL-8: The insert that is inside the reel seat (not the visible part) is too large and doesn t fit into the blank. The result is that you can't push your blank far in the reel seat. I believe it is not very good and could lead to blank breakeage.

I like the design of these reel seats though, but I think it is too early for Pac bay to sell them on the market...

Serge

The only thing I can add is that for the most part, fly reel makers have never decided upon a standard reel foot size.

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The Old Florida fly reel foot is a part of the problem. I have a couple Old Florida reels and the older one has a thicker foot which every fly seat--even the CL8--holds reasonably well. The newer model OF reel has a thinner foot that is a problem with many of the reel seats I've tried including a Struble U7. I've tried the CL8 with a number of different fly reels--Lamson, Ross, Abel-- and the Old Florida is the only reel it won't hold securely.