The company is called Indian Machine Tools - have a quick search on here using 'Indian Machine' as a few threads contain some info - example below.
http://www.peachparts.com/shopforum/diesel-discussion/384182-fuel-injectors.html
I had a few dealings with the company over several years, always found them to be reliable and straightforward.
They have an ebay shop also, you can ask for items to be posted up as a listing which gives some buyer protection.
If doing this yourself you will probably need shims too, have you tried messaging 'greazzer' from this forum?