The front cylinders are numbered Wagner FD-7228 on the front and say USA G168 on the back. Doesn't sound very Swedish. I'll do some checking.

On a similar note I'm going to be interested to see if my generic Stewart Warner fuel gauge sender works as well in the car as it does on the bench. It is like the one I used on a homebuilt airplane a few years ago. $24 with two gaskets versus over $100 plus $7 for a gasket for Volvo parts. Fits up in the tank and seems to work well on the bench. Took a bit of float arm bending, but otherwise seems fine. But I won't have the car running for months so who knows if that "workaround" will pan out. Worth a try in my book.