1. Go up to the product category to get a new selection of MOSFETs.
2. Tick "In Stock"
3. Select Packaging: Cut Tape, Bulk or Tube
4. Technology and FET Type: MOSFET, N-channel
5. Supplier Device Package: I-PAK / TO-251 (find and select all equivalents)
6. Vdss >= 50V (select all options or enter value in the Min box)
7. Rds On <= 150 mohm (ditto)
8. Gate Charge (Qg) within +/- 30% of original value (7.9nC)
9. Vgs(th) ditto (1V)
10. Sort by price, lowest to highest. Find a reasonably stocked part with similar parameters. If you're just replacing things, stock probably doesn't matter to you. If you're substituting a BOM item, probably find one that stocks well at DK and others (maybe use Octopart or other supply aggregator to check?).
Power dissipation, pinout and other features probably don't matter: IPAKs aren't usually heatsinked, so the power dissipation rating will not be reachable anyway, and pinouts are always consistent (but, hey, do check the datasheets to make sure). Brand and series probably don't matter much, either; DK stocks quality brands.
Tim