I guess the only thing you could do is buy 2 chrome or stainless tail pipe sleeves and fit them over the short saloon tail pipes. However this will only work if you go for a ZT back box with the straight tail pipe exists, as you mention getting a 75 back box, that would have tail pipes which point down slightly.
If funds allow, I'd recommend going to a custom exhaust shop such as a Longlife dealer and getting a stainless one made and fitted, as Trikey suggested above. They offer different sound levels, and you can opt for OEM quiet if you don't want it to be any louder than your current box. Our one we recently had fitted at Longlife watford was 160.00 fitted.
If you're going for one of those cheap pattern part back boxes, you'll find yourself having to change it again in a couple years time as they don't last very well. With the stainless ones you generally get lifetime warranty.
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