I saw that headed tank... Bonkers, I'm just going to fit a 4x4 one with converter pipe when mine finally perishes.

I keep my eye on the classifieds and it looks similar with a lot of brands (also into old Porsches and VWs). The really expensive (some might say overpriced) stuff can hang about for months and months and even then I'm not totally convinced they are selling for the asking price.