You wont get a set of MSD's from Rock Auto. These are high powered better quality ignition coils.
I usually have a look on US Ebay and Amazon but if you put that part number in Google you should have some options. Probably going to be £250 ish by the time you have paid the shipping and import duty.
Just looked and there are a set here
https://www.amazon.co.uk/MSD-82428-B...%2C1135&sr=8-1