If you have a ball joint front suspension, which if you have four bolts wheels, I guess you do, there is a easy way to convert from four to wide five bolt drums. I have done them many times on 1969 and newer Beetle suspensions, which all were using the four bolt wheels and drums.
On the front, use the drums made for 1966 or 1967, as both years used the ball joint front suspension , yet had wide five bolt pattern. The same spindles can be used and as I recall, the outer bearing , the small one, is the same on 1966 and 1967 as used on the 1969 and newer standard Beetles. With the 1966 drums, you might have to change around the race for the inner bearing from what your four bolt drums have to what is needed to fit both the 1966 front drum and the spindle.
It does not require any other suspension changes and the brake shoes should be the same width, so front brakes remain the same. Or, you can option for disc brakes and then order the sets for 1966 and 1967 Beetle and again, as they give you new spindles with most disc brake kits, you will convert from four bolt drums to wide five for your ball joint front suspension.
On the rear, just pull off the four bolt drums and replace them with the wide five bolt pattern, either 1966 or 1967 drums, if using drums. You might need to add a spacer on the rear stub axle to position the wide five drums where they clear the rear brake shoes, but with a light weight speedster, you already have more than enough braking, with disc on front, drums on rear. I was stopping my 1969 Bug, used only for drag racing, from 108 MPH with only drum brakes and the car and driver weight was 1900 pounds. So, again, my point is with disc up front and drums on rear, more stopping power than anyone really needs.
This is the lowest cost conversion I have found. Now, if money is no problem, there are other options. I was pointing out, if the rear wide five pattern drums seem to barely cover the 1969 or newer rear brake shoes, it does not matter. 70% of the braking on cars is done with front brakes. No machine work is needed.