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According to KIS part number of 13E is 9389538 and of 13F is 9389537.

That said:
1. I'm not SURE these are for KAFAS4. Computer (KIS) says they are for KAFAS3. It could be they are used on both.
2. It does NOT mean you can actually BUY these part numbers.

KIS p/n != ordering p/n

As far as I've seen they are ==. Except when you can't buy them at all. So provide at least an example where they are not. And don't start with obsolete unit part numbers, because you need to find a replacement unit part number which is still available in KIS.