I think I know what your problem is.
Is the wheel fouling on the hub flange bolt heads? It sounds like it to me.
When I bought my spacers, they came with a full set of allen cap bolts to replace the existing flange bolts. These have smaller heads and provide more clearance. I didn't need to use them, I think it depends on the particular type of alloy wheel you are using.
I still have them in a bag in my workshop, if you get no joy from the seller, PM me and we can sort something out.
Without wanting to hijack this thread, my spacers are now for sale. TUV approved 30mm billet alloy spacers for Disco 1/defender/rrc axles from Scrapiron racing. Very good quality, much better than ebay stuff.
Anyone can feel free to PM me an offer if interested, as a guide to prices, look at what spacers cost on ebay.
Stu.