Hogue Tamer forend

[stangallmotor]

Hello, I have the mossberg 500A combo from big 5. It's the 6 shot model with 18.5 inch barrel and the maverick 88 one piece forend. I bought the Hogue Tamer pistol grip and forend but I need to buy a new action slide tube assembly to fit the forend. I also bought the Hogue adapter nut for it so can I just order a 6 3/4 inch assembly or do I need something else? Thanks