From the manual it looks like the CS100 (filter C-8410) and CS150 (filter C-8414) have the same size housing and same size filter measurements (Diameter: 8-15/16" Length: 23-5/16" and 4 inch ends). The difference is the amount of filter media. 100 sq ft vs 150 sq ft.
My question why couldn't you put in the larger filter and be good to go?
I think this is what's on my pool. Still waiting but from the distant pictures it looks to be it. It's on a 17K gal pool with 1hp pump.