I've heard through the grapevine that both pump heads fit the same block, they've apparently done this so that if there's a shortage you have a choice of 2
Are you sure its a fixing bracket ? I had to go a cheap install and it was a Glowworm compact, and their method was all one piece so the bracket and boiler are not 2 separate pieces.
Don't be fooled by this boiler. Just had it installed 2 days ago and I personally would not recommend it to anybody looking for a reliable product. I didn't choose it because of the price but rather the installers recommended it over the other greenstar models that I initially was leaning towards, like Greenstar 4000. Regardless, 10min after the installation the boiler is dripping water on the front-right corner and is thus loosing pressure. It isn't leaking at the pipe level but rather inside the boiler itself, which makes me think that QA wasn't done right.. Not only that but unlike any other boiler I've had before (And I had 3, including new and old products lilke Greenstar 4000, Vokera 25, Powermax 140), this one is buzzing like a bee. It creates vibrations that travel through the walls and can be now heard in the whole flat, which is extremely annoying. I am now seriously looking into replace this piece of crap and install something more reliable.