Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What was the highest grid value for riders with manufacturer of Aprilia and time of +1.660?

### Inputs:
table_name: table, columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']

### Response:
SELECT MAX Grid FROM table WHERE Manufacturer = aprilia AND Time/Retired = +1.660