Grant 846 Tuff Wheel install question

I ordered the 846 wheel, and a member on here is selling me the factory adapter can. Do I still need to buy the install kit from Grant? Or will I be able to reuse my stock horn stuff on the new wheel in can?

Thanks
I did that same install last winter. IIRC for my 68 Barracuda I had to buy the Grant install kit to get the circular plastic piece that the horn button of the Tuff wheel mounts to.
The OE 68 Barracuda steering wheel system did not include that part.