Wanted to buy - SW20 Strut Bolts (extended)

My car arrived from its previous owners with 5.30 degrees neg camber on the left front and 4.48 neg on the right.
Although I was totally new to MR2s and track MR2s in particular, I thought this was a LITTLE excessive. The car was NOT fitted with adjustable camber tops. Took it to my local wheel aligners (run by a proprietor with considerable race experience including a class win in the Bathust production 12 hour) and they were able to make no real impression on the camber alignment.
 
Finally decided to bite the bullet and buy some adjustable camber tops to give me some more control over the camber (looking at 3 degrees neg).
 
Took the struts out of the car and found how the previous owners had achieved such wild negative camber without adjustable camber tops. They had welded smaller 13mm clearance washers to the strut mounts and used longer 13mm bolts in the hub upright holes designed to clear the OEM 15mm strut bolts. Interesting engineering to say the least.
 
My solution was to remove the small washers. Weld on new washers to suit 15mm bolts and replace with 15 mm bolts which are the correct size for the hub.
 
Only problem is that with the washers the bolts need to be at least 60mm and preferably 65mm long.
 
Have tried all the bolt suppliers thatI can find and they tell me that 15mm is an "automotive" size and have been unable to find a stockist.
 
Anyone had a similar probem or have a souirce for the bolts I am seeking$ I intend to head for Japwreck tomorrow to see what I can find.