I am not convinced that Eastman will have the correct PTO Kit available for your 448. The last 448 rolled down the assembly line in 1988 which is 25 years ago. You would be far better off seeking a used PTO kit on e-Bay and having it shipped to you by USPS. Customs will charge you 13% HST on the Canadian dollar value plus another $5.00 fee to the Post Office for collecting the HST. There are not duties on this item because it was made in the USA and falls under the Free Trade Act.
You have a long wheelbase tractor. Therefore, you need a complete PTO kit from a 444, 446 or 448 made for the 1980 model year or later, so that the lines that run from the PTO valve on the rear to the travel/lift valve underneath the tractor are the correct length.
In the alternative..........you might consider purchasing everything except the steel lines. It would be far less costly to ship because the package would be substantially smaller. Once it arrives, it is a simple task to bolt the valve bracket to the rear of your tractor. If you have the use of a trailer that could transport the tractor to a local hydraulics shop, two hoses could be made to take the place of the steel lines. Having the tractor right at the shop would ensure that the most efficient hose fittings are used and the hose lengths are correct. Currently, used PTO kits on e-Bay bring around the 200 dollar figure. Sometimes more, sometimes less. The current price for a PTO kit that fits the newest tractors, sells for $850.00 US.
If you see one on e-Bay that interests you, feel free to send me an e-mail. I will look at it for you to make sure it will work on your tractor.