rlong,
If you're concerned about buying from overseas, you can run some checks yourself.
1. Use google to check the firm's website is referenced by others. New or unknown sites won't be referenced. You will also see what others say about the firm and whether they are happy with their purchases. In this case use google.co.uk's 'pages from the uk' option will give more relevant matches than google.com
2. Check on the firm's website or better still on other indirect sources found using google that the firm has a physical address, have been trading for a while, are of reasonable scale e.g. have employees, and are experienced in mail order, including sending items overseas
3. Pick up the phone and make sure you can talk to a human being that answers the phone professionally and knows what they are talking about
4. Use a credit card with Internet purchase protection
I think you will find that SJSC will pass these simple tests. If you're really keen, you can also check the UK company filings online to see that accounts have been filed on time (this may be difficult as the trading name may not match the company name), and pay £1 to get a couple of their recent filings. Alternatively if you are a business you can pay a credit reference agency to do a less thorough check.
You will see here that SJSC is up to date.
http://wck2.companieshouse.gov.uk/a6...2//compdetails
As a last resort, buy some cheap 175mm cranks and get your local machine shop to drill and tap another hole at 150mm for you. You can then use a hacksaw and hand file to remove the extra length. It's not a difficult job.