Here is an easy to use metric of how wide these need to be, no measurements required (I suck a measuring at any scale). The rear of the parts need to be no wider than the inside of this blacked area under the repressor bit in order to fit onto a GW epic Armageddon Rhino chassis I assume it's designed for.
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The repressor and the exorcist parts need reduced in width accordingly; it's an immediately noticeable difference even at distance. Sorry for the blurry photos but that's life, eh?
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The immolator on the other hand is almost perfect, it's only just perceptibly wider than it should be It's slightly annoying but, as it can be fixed with the same amount of effort as an easy moldline, I'm not really sure it's worth changing.
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The repressor needs reduced in length by approx half to 3/4 the width of the black line on the first picture to the outer rear edge, otherwise the turret seems like it's floating slightly. You could get away with leaving it as is, I could just glue it slightly further back, but I'll work a fair sight better if you amend it. The others are A-OK lengthwise.
I have a feeling this might fit some of my more exotic amature cast rhino miniatures but they are at the other side of the country right now... And let's be honest, that really helps no one if they do. Once get them in my hands again I'll have a play and see how they compare.
Once these minor dimension changes are done I can heartily recommend these bits though. They'll be 100% compatible as long as you don't mind filing down surface detail on the top of the rhinos you use.