hmm... the picture of the heel liner that one of the forumite
shown, is very thin and is only cushion at the middle of the
liner..
the one that i bought, the whole liner is cushion.. like a sponge..
so when u paste it at the heel at the tip, u wont get blister
one..
i think u can only find the one that i bought at Far east plaza,
sole rassion is the brand of my shoe, where i bought the liner. cos
i have try far east plaza 2nd level & bugis village, both
places only sell the thin liner with cushion at the middle.
go buy it.. is only $2.90. if it really helps, then u can wear the
shoe w/o blister at least at the heel area. hope to hear your good
news ya! 
if u need hor, pm me your email address, i will take picture of my
shoes + heel liner for u to c.. cos i bought one more extra liner
that time.