right order the metal hl tiger sprockets and cut the outer ring off it make the correct shaped boss as per the carrier, bond / pin the ring onto the boss and voila.
if the diameter is not correct then you will struggle as the pitch of the teeth will be matched to the segments on the track, and a bit of jiggery pokery will be needed, you may end up having to cast your own rings for it. if push comes to shove, use the tiger rings make a center for them and use full length sand guards on the carrier
Rich