You could try emailing customer service via this site. In the past they have posted out replacement game parts, even for those that dogs have eaten (yes it's true!).
However as the game is the old version, they may no longer have the parts. Still, it's worth an email.
The alternative to buying a new set or making your own would be to make some kind of distribution chart, rolling dice against this instead of drawing random tiles.
In the base game there are 23 tiles:
3 X hiding tiles
3 X Friendship tiles
3 X travelling tiles
3 X fighting tiles
6 X Next Event tiles
2 X Ringbearer moves 1 space into the dark
1 X move two spaces into the dark or Eye
1 X group discard 3 cards or next Event
1 X group discard a card, a shield and a life token or next Event.
If you have the Sauron bag you may also use the dark tiles and the 4 Sauron tiles not mentioned here (but I don't recommend it, unless you never want to win)