The wheels are 4-lug, but on a 4x108mm patern, same as Ford, Peugeot and some early Audis. Not much use unless you plan on using 4x108 pattern aftermarket wheels.
The disks and drums WILL fit your swing axle bug, the drums will slot on right over your existing brake backing plates and the front disks will slide right onto stock VW disk brake spindles. The front calipers won't fit though, you'll have to use beetle calipers. The front disks will increase the front track, I believe the raised boss that the wheel bolts to sticks further out in relation to the disk face than a stock beetle disk.
As you mentioned, the seats can be adapted to fit, the steering wheel will fit some years of beetle, the gauges are always worth saving. I have a full set of 6 924 VDO gauges plumbed into my bug. The rear torsion bars are an upgrade over stock VW ones, but I'd imagine they're IRS length (longer than swingaxle torsionbars).
The rear seat back is the right width to fit in a bug, but is only a few inches high, and too short. If you were really scrapping it, you could cut out the floor of the car below the two rear buckets and weld it into your bug to replicate the 924 rear seat in your bug. A lot of work though.
After that, I don't think much else will cross over, but you'd have a better idea if you had both cars in front of you. Best of luck with it, and keep us posted!!
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