Item description:

Tritoch tail is missing a piece of his tail on the bottom right when calling his summon. This is because its frame data ($63C4EF-$63C523 in the (U) version) is missing a byte pair. The first byte of the pair is a X,Y position (xxxxyyyy) of the block in 16 pixels intervals. The second byte determines the block taken from the monster graphic as well as whether it’s flipped horizontally and/or vertically.

Since the first two couples (10 01 and 20 02) reference blocks in the mold containing no graphics at all, we can use one of those to insert the missing couple 35 07.