• A 15mm and 22mm of this for the front?

    I’d try the 22 copper option first.
    There are reaming tools for de-burring cut pipe that you could use to sharpen the fitting and the 28mm pipe - you could play around with chamfering the inside or outside to alter the size.

    Or just buy steel punches
    😂

    You’ll need something odd for the 26.6 mm though.

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