I recently purchased a 68 rs and it has a nice rear fold-down deluxe back seat, but the front buckets are standard in poor condition. A friend told me they are from a 67. Can I simply purchase 68 deluxe foam and covers or do I need new buckets due to the wrong year? Is there a difference between 67 and 68 buckets? or standard vs. deluxe buckets? Any feedback would be appreciated.