Elaine, one of the issues, as you will have read in this posting is the uncertainty of the size of the replacement parts.
I for one would rather pay a couple of pounds extra to have a selection of sizes of the male stub elbows so that the installation can be complete in one operation rather than having to reorder if the parts do not fit.
Hence I will probably fit them in the winter when the car is off the road.


Ian
2011 Plus 4
Wild Mogs Reims 2019, Goodwood 2018, Isle of Man 2017, Carried on to Caramulo" 2016