Hi, I have a mk1 VRs and looking at buying an exhaust off an Ibiza pd100. I know the chassis are the same but I’m more thinking of the downpipe and whether that will fit. 
cheers. 
As for size, not sure If the pd100 runs less than the standard 130 2.25”. But this is not an issue as the exhaust is 2.5”. 

I can confirm from the photo that you appear to have an exhaust system lying on the ground.

 

Only measurements will tell you if it will fit or not, but it probably will fit with some minor mods for sure.