Hi Rob, If you want the car to look authentic, you can get wheels and the proper inserts from RSSlotracing.
RSSlot makes (and has done for several years) wheels identical to the BWA wheels which are no longer available. They are very well made, and have some bead detail on the wheel rim which makes them look really nice........our local area clubs use a ton of these. They also make a line of inserts which are a perfect fit, and they do have a Halibrand insert which is/was taken from the original Monogram Daytona coupe.
You will have to do a little work, or spend a little money however, to do the swap for the originals......1/ you could file/sand the knurls on the original axles to accept the new wheels,......I advise strongly against this !!,....or, 2/ you will need to replace the rear axle, and possibly the crown gear and bushings with some 3/32 double flanged bushings.
You also can use wheels from anyone you like, (CB design,Slot-it etc,...they are all great ), and turn down the original wheels to use the inserts, but you will lose the look of the RSwheels.
Any wheel with an exposed boss coupled with a tread surface width of 8mm or more will be a very tight fit, and will be well over scale width.
Attached are a couple of shots of a "Daytona" that I built a few years back for our local club's 60"s sports car class......it uses the RSSlot wheels and inserts.
The bead detail on the wheel, adds to the realism

I have used 7mm wide rear wheels, with 9mm width rear tires.......club rules, but a very scale width for the 60's cars

The 9mm wide rear tires look perfect.

The part numbers are as follows....
Wheels..RSW002..(15 x 7mm wheel)
RSW003..(15 x 9mm wheel
inserts...RS1525...(Halibrand with knockoff)
Hope this helps
Cheers
Chris Walker