You will need to use the damper puller you used to remove the crankshaft damper, but you will need to get a second bolt that looks just like the long bolt that you removed from the lower timing belt cover. It is an 80mm long M6 bolt that you can find at a good hardware store.
You may want to search the Forum's pages as there have been more than a few discussions on this same topic. I and others have discussed methods to remove the old seal and install the new one. The $6-8 National 710220 (yes, I know it's listed as a timing cover seal, but it) is an exact repalcement for the OEM seal.