My WL cap set fits a Nova X-85 which is a CNI black and gold series. It fits very well in fact. It will not fall off even when shaken. I don't understand why you say it doesn't fit unless WL made a different kind of cap set which will fit their executive fusions and pulsars but not CNI/X-series/Viper?
Can you clarify? Maybe it does fit their laser so you might not want to lose out on a possible sale.