I've got the printer (it's an Ender 5 Plus) and I'm testing it now, to start with I'm printing a piece at 405mm for myself, to replace the 2x200mm pieces I made previously.
Also I've had a proper measure in the van and revised the piece sizes a little. The new piece lengths for my LWB from front to back;
1. 200mm
2. 290mm
3. 245mm
4. 245mm
5. 405mm
6. 145mm
I have altered the length of piece 1&2 to suit actual seat positions, but they still add up to 290mm, as before.
Piece #1 may be different for you, depending on how the front of the rails is covered (mine has a piece of angle aluminium over it), and how the front of your seat is finished (mine has a 15mm ply front on it, which clears these trims). If your seat positions are the same as mine, all the other pieces should be ok.
Piece #5 was 2x200mm, now slightly longer at 405mm.
Piece #7 - I don't need it, we never put the seat all the way back, if you do, I can make a piece to your measurements (for us it would be about 400mm). If you want these pieces I'll do them for an extra £10.
@Dorlo - are you still interested?
Mods - When I have a set to photograph, I'll move this to the FOR SALE section, hopefully it's ok here for now?