Bullet Style Mirrors

I find the mx5 mirrors extremely sensitive on the mk1, and know that some mx owners have bullet style mirrors. I dont want to purchase plasticky ones off ebay cheap but spotted these on ebay and wondered if new holes would have to be drilled to fit.
Bearing in mind I only want to pay a max of ?35 for a pair.

I like them though?
What are your thoughts on bullet style ones, I know they limit the view but I always look over my shoulder in every car I have had to double check.

http://shop.ebay.co.uk/i.html?_nkw=bullet+mirrors&_sacat=0&_trksid=p3286.m270.l1313&_dmpt=UK_CarsParts_Vehicles_CarParts_SM&_odkw=jdm+wing+mirrors&_osacat=0&bkBtn=