Will this fit my Spark without modification?

Yes. This radiator mounts at factory points with OEM hole locations — no drilling, brackets, or adapters required. Drop it in where the old one came out.

Do I need to flush the system before installing?

Flush out the old coolant and lines to remove sediment and debris. Fresh coolant protects the new core and prevents clogs. Refer to your service manual for coolant type and capacity.

What about hose connections — are they the same diameter?

Hose barb diameters match OEM spec, so your existing upper and lower hoses will connect without adapters. Confirm hose condition before reinstalling; replace if cracked or hardened.