Needs Foam Tips for SoundMagic PL21

[ratul]

I have SoundMagic PL21 and use them with large eartips supplied with it.
Problem is that they sometimes slips too easily from my earcanal, (XL ones dont fit in.. )
So was considering for some foamtips.. (of large size i think or you can suggest.. )

I found these two, but not sure if they will fit into the PL21's.. (Also seems to be quite expensive )
Soundmagic Foam Tips [ 3 Pair Medium Size ].
Soundmagic Foam Tips [ Pair Each - Small , Medium and Large ].

Also pls suggest some other foamtips compatible with PL21's.. (Preferably if SoundMagics provide them..)