[Closed] Installing an E-13 SRS chainguide kit, crank/spacer question.

Alright gents,

Just installed the E-13 SRS kit below
http://www.ebay.co.uk/itm/251105621175?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

Only minor issue is that if i installed with just the ISCG bracket installed instead of the BB spacer(73mm so 1 drive side spacer on a Shimano HT II setup) the back of the cranks rub on the indside edge of the back-plate.

So if i install a 2.5mm spacer on the BB along with the ISCG05 bracket, it all works like a dream. Chainline is perfect and no rubbing on the guides etc.

My only question is, is it OK to add in the extra width of the ISCG plate and it all be OK ? It's only 2mm or 2.5mm wider, but should be fine shouldn't it ?