200tdi conversion downpipe

just another quick question.
The downpipe on my 200tdi conversion is rotten but only the lower part not the top section where all the bends are.
Is it best to order a standard downpipe and cut it down and fit and clamp into the angled bit.
I ask this as a downpipe is £30 where the conversion with the new angled bit included is £80

It's a 1989 110

I brought the conversion when I did mine but my mate had a garage do his and it's cut and welded and does the job

Have you tried asking Steve Parker if you can just buy the bottom bit, assuming it's a SP pipe of course.