Seeing as Ronnie has bumped this up, I got a free set of runners if a DAF 4tonne truck that the lads were changing the seat on.
Sounds like they might be dodgy coming of a truck but the runner bit unbolted from the mechanism that raises and lowers the seat.
It is quite low and skinny. Might require a little fabrication to fit seats to but that’s what it’s all about!
Cheers Ginge