Size of tongue arms on FC 23FB

[Bobbo]

How wide are the tongue arms on a FC 23FB? I won't take delivery of my new one till 4/27 and I am thinking of taking a Reese Trunion WDH with Reese DC for them to install, but it says it won't fit tongue arms over 2.5".

Thanks.

[dznf0g]

2" x 5", iirc,

Edit, a 23 might be smaller. Can't remember where the cutoff is, but none are 2.5 wide.