Genuine Inlet Manifold - Rocking Horse

Standard inlet manifold fault and symptons on a 2013 Disco 131k 4 TDV6. Fault codes all concur. Started ringing around last Thursday to purchase the Right Hand Side (from drivers seat) Genuine Part from my usual reliable local suppliers. No joy for a Genuine, although the consensus from my suppliers are that Land Rover has changed the polymer make up from their manufacturer, to try and improve upon the original chemical mix. However, cant find a genuine one anywhere - I have now tried all 4 regions, all online suppliers. I can get a Britpart, but I am reluctant due to fitting time and costs to be replacing this in a year or two. Has anyone fitted a Britpart and found it was ok to fit and has lasted - or, does anyone have a Genuine RH TDV6 3.0 in the parts cupboard willing to sell. Note there are a few wallies trying to sell original for £1300, yet, Britpart sub £120. Any experiences with Britpart inlet manifolds I would be gratful - otherwise, any contacts for a genuine would be gratfully received!

Don't know if genuine or quality oem but they're a good supplier