Push-on Oil Hose for 1/2in AN8 fittings

Nearly any 1/2" Oil Rated Hose will be "Up to the Task".
The Oil hose connected to the Oil Pump is a suction line.
As long as it doesn't collapse, it is good.
The Oil Hose connected to the bottom of the block has a Max spec of ~6 psi.
2-3 psi is a typical operating pressure as it does double duty as the crankcase ventilation line.
You will be hard-pressed to find a hose that can't hold these pressures.

The Stainless Braids are mostly for cosmetics and abrasion resistance for this application.
The Internal diameter is what is important to allow full flow at these low pressures.
The demands on the Oil hoses are low.
Pick a quality rubber hose and cover it in fire sleeving for abrasion and fire resistance.

Richard,

As you have discovered, if you search for "1/2" oil hose" you will get few results.  With respect to push on fittings, the industry considers 12.5mm hose the same as 1/2" and you will find more listings that way.  Many 12.5mm hoses are also marked (1/2"). Yes, 12.7mm would be more accurate but that's not what the industry sells.

To further complicate this, Rotax offers both metric (12mm) and UNF (AN-08) oil fittings for their engines.  You will find both listed in the Rotax Illustrated Parts Manual.  But, the only oil hose shown in the manual is the 12mm hose that's fits the metric fittings. Nevertheless, if you have -08 fittings, you need the 12.5 mm (1/2") hose.