theres about 4mm difference, the vtr slightly smaller but should work fine hears the bits ive modded and this was fitted to a silvertop 90bhp
first the injection wiring runs down between the middle legs of the inlet and you need to drill a hole big enought for the plug to fit down through

not pretty but its not seen when on but needs to be an inch square as its a big ass plug
next map sensor but straight forward
this will get cleaned up as just wanted it to seal and run
next icv i drew round it as didnt have drill big enough bit drilled lots of small holes the filed it till smooth then drilled and tapped screw holes, the icv has its own seals and as lond as you dont drill to big a hole its seals on the rubber o ring
next throttle body, redrill holes to match inlet see pic, and all the wires will reach no probs and it uses all your own sensors, you will need diesel throttle cable but if you order it throught a motor factors its one you can cut to any length and they give you all bits
and youll have to make up your own throttle cable braket mines a bit of a bodge but did work well at moment, as the throttle boddy is on angle it makes life a bit more difficult
and voila
it idles perfect and makes the most amazing roar ever id do it over and over just for noise and its made quite a differnce all round to mine very happy for easy mod that start to finish cost me about 75quid
inlet was £65 on ebay
s reg diesel throttle cable 11quid
rallye in let gaskets £2.50
sealent etc £5
hope this helps and is alot easier than fitting rally throttle boddie and cutting wires whole job took 4 hours