Yes I to have put a 200tdi into my 109 and also thought that a Steve Parker would be a good investment until I came to fit it, yes it's well made and all fitting and was supplied . But I had same head scratching and after much moving bits about and assembling it on the drive, I rang them sorry having a problem "oh it will fit, we make them fit can you bring it round".
Well like most projects it wasn't complete or drivable and it would be a 200 mile drive on the back of a trailer, so lets have another go, Extended front pipe 70mm then cut the tail pipe so I could rotate the silencer into the correct place, weld tail pipe.
Not a straight bolt on fit, Rang Steve again and he told me well there are so many different combinations in the design by land rover that they could supply One that fits all, and alterations and modifications are required to fit these exhausts, also the tail section it standard land rover part.
I was a bit miffed, Only from the point of view that if I had been informed that dependant on the engine and gearbox placement that any of the above would be necessary you are ready to make these adjustments to a £300 item.
Yes I take on board every Land rover conversion is different, but a mate of mine asked me how I got on and after I told him he said that's funny as I had the same problem several years ago with a Steve Parker V8 exhaust, so next time I think I will get one made.