When I made the original post the SONAX must have been in very short supply in the U.K. as it was shipped from Germany.
Ordered 2 variants of this after nearly choking on my breakfast after seeing the cost of a Mazda AFT roof seal.
I bought a SONAX stick as it seemed ok when I used it last time, though it seems to come off on exterior foam/rubber after a few months, though not sure of quantity I found it for £9.00 on ebay. The last one from Amazon never turned up and there was no way to complain through Amazons systems. And also bought twin pack of 100mm Nextzett Gummi Plege to see what it is like. Have some light cracking on the outside edge (front corners where it probably gets the chemicals from road spray and my washer bottle regularly doused all over it) so it needs a thorough smearing over with conditioner on the next dry day.
I prefer to try and recondition the original than use cheap, ill fitting length off ebay. But the Mazda original price is

.
Always little jobs to do on the Bongo to keep them good, you do need to be a bit of an enthusiast with them, at least keeping up on the smaller jobs.
Just for your info... Amazon have it for £6.46 !!! If it turns up.
They call me light foot.