Well, long ago the Mileage Challenge got Surpassed as I couldn't find a new timing belts' kit on time; but now I have to update this Thread with new information: I had to buy separately the left and right timing belts in Gates brand, the T-299 and the T-300.
The old Timing belts worked Coverless for more than Eleven Years almost reaching twelve and also reached a total of 114,XXX Kilometers, which means a little above the 70,000 Miles and those belts doesn't looked as bad as other timing belts that I've changed in other cars, even in this mere Subie in the past, when it had the covers for the timing belts; so, the warm air blowing from the radiator and the centrifugal action has helped these belts to be cleaner and last longer, being Coverless; as the covers tends to get oily and dirty.