Anyone know where I can get rough cast short alnico 5 magnets for humbuckers?

[Jennings]

Anyone know where I can get hold of some short, rough cast alnico 5 bar magnets for making some humbuckers?  I'm trying to get hold of some in as close dimensions to the type that would have been used circa 1960 - 62 in Gibson PAF/PAT types.  I'm based in the UK.  Looks like the dimensions I'm looking for are around:
 
2.371" (60.022mm)
0.491" (12.471mm)
0.121" (3.073mm)

[Willabe]

What about Stewart McDonald?

[Ed_Chambley]

http://www.mojotone.com/guitar-parts/Alnico-Bar-Magnets

10th item down the page.

[Jennings]

Cheers for both your replies...just what I needed for my little pickup modding experiment