Get quotes, we're on the other side of the country. Likely your local places will be a bit cheaper than over here too.

Call subaru parts with your VIN number, they may surprise you with price. Call wreckers, call aftermarket suppliers. Call your local subaru specialist mechanics, they might have parts laying around.

Replace any worn/cracked coolant hoses while you've got the coolant out too, and use OEM coolant unless directed by your mechanic.

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Slow is smooth and smooth is fast.