New Speedo cable doesn't fit

Hi,
I purchased what I think is the correct cable to replace the one that broke. I've got a 1987 (D reg) Landrover with the original engine, transfer box and gear box. From this I ordered the speedo cable with part number PRC6022 however when I come to fit it, the metal square cable is about 5mm too long and doesn't git into the back of the speedometer. On the parts catalogue, it shows 3 possible varients - rhd 4 cylinder, rhd v8 and a lhd type. I've purchased the 4 cylinder rhd one.
Looking at the old one and new one, it does appear that the part that goes into the back of the dial is different on the original and the replacement. The original one has a tapered plastic square insert whereas the new one is just a metal square insert with no taper.
I've a speedometer from a 200tdi and that fits the new cable better.

So have I got the wrong part or do I just need to force it in or should I just cut the square drive thing by 5mm and hope it doesn't fook it?

Thanks

Jasper

Whats your chassis number?

PRC6022 is for vehicles from 268135, not sure what 1987 would be....

If yours is before, looks like it could be PRC5663 and PRC5567 (it comes in two pieces)

Google those, do they look more similar to your broken one?

The old one was not a two part one. In the end I just forced it and it seemed to just about go one. Probably will pop off soon but at the moment, it seems to be good enough . Cheers