I had a roll cage company near me make and weld this in. Took about half an hour...can’t remember what it cost but it wasn’t over a £100.
I know that sounds a little expensive for a bit of tube but I don’t have a welder!
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Do you have any measurements of the bar you had made per chance? The car isn’t local at the moment so I won’t be able to get to it just yet to take measurements.
Don't know where you are but I can do you a custom harness bar in CDS or T45 if you're local.