If the platform extends back over the rode hatch, any vertical windlass will do, like a Lewmar or Good. You need to make a hole through the hatch and permanently attach/ seal the hatch. If the windlass mounts directly on the hatch and not on the pulpit platform, you will have to do more work. The hatch is not strong enough for the load and will have to be beefed up. If the boat was prewired for a windlass, check out the wire size and breaker rating. That will narrow down the windlass choices since many draw more current than the prewire was sized for.
if you contact Grady support, thay will tell you what models they use for that boat.
Keep in mind that most windlasses still require you to go forward to release the latch and in theory to latch the chain when the anchor is stowed. In addition, you can get a regular or free fall model. There are models that freefall 'automatically' ( from the helm using the switch). Some freefall modesl don't always work as planned depending on the specific anchor and the roller. The roller on the Grady kit is fixed I believe.