I sure it's a small Chevy 5 lug. Essentially a 5x4.75" with low offset and 7/16" studs.
The bolt pattern for a 1972 Chevelle Malibu convertible is 5x4.75 inches (5x120.65 mm). This means there are five lug bolts arranged in a circle with a diameter of 4.75 inches. This specification is common among many Chevrolet models of that era.
5 lug - 4.75'' spacing
If you are talking about the wheels, that's the size of a small bolt pattern 5 lug GM. Cars like the 70's and 80's Impalla, Camero, Chevelle, Malibu, Cutlas, Firebird, etc.
5x115
5x115
5 lug 4.33 inch or 110 mm High Positive Offset
5x5
LUG SIZE IS 13/16THS AND IT IS 5.5 BIG BOLT PATTERN
That depends. If the Ion has 4 lug wheels (4x100 bolt pattern) then no. If it has the 5 lug pattern (5x110 bolt pattern), then yes. 5 lug Saab wheels should also fit.
Bolt Pattern: 5x120 • Center Bore: 66.9 • Hardware:14x1.5 Lug • Offset: 34-45mm
5
5x4.75 also know as GM small bolt pattern, same as firebird, camaro, vetter, GTO, chevelle, Monte Carlo, cutlass, s-10, corvette