I have Sumitomo MK63 4 pot FIA calipers on my 1200 and I'm running 13" tires.

There are places in the states that you can send your old pads to have them relined.

As far as the rebuild kits they are expensive when found.

The most difficult to find is the pistons.

If you go onto the Japan Yahoo site you will see what they have to offer for the MK63's.

If patient,most times,good and affordable parts come up for sale on yahoo japan.As for the mk63 parts,i.e the seal kits, were very rare and expensive a few years ago on yahoo japan auctions.Not too rare nowadays but still hard to come by sometimes.

i.e
heres a link for 1 new nissan mk63 caliper piston.Buy it now 2840 yen(in japan) which equates to roughly aud$36 and landed in oz approx aud$100 -120 dollars depending on state and whether shipping or air freight. Thats the price for one new piston.The seller has given the customer the opportunity to let him know how many pistons they want to order.Would be cheaper to order a few and save on shipping.

http://page2.auctions.yahoo.co.jp/jp/auction/b123394378

However the pistons are hard to come by.for instance, if above seller runs out, one will have to wait for a pretty long while b4 getting others for sale.Demand and supply..

and heres a link for a new seal kit to overhaul the mk63 calipers.Landed in oz and depending on whether air freight or shipping, will roughly cost 130-150bks aud.

http://page11.auctions.yahoo.co.jp/jp/auction/n103358054

The calipers on the hand could be affordable if not too many bidders.In the past some race compound brake pads have come for sale at almost steal prices on yahoo japan auctions.


cheers

Easier to get an individual/company that buys stuff for you off japan yahoo auctions So all you do is browse the auction site and look for items.
And one can use a couple of language translator websites to help one translate from japanese to english. i.e google web translator for instance.

Ps, do some research about the mk63 calipers and nismo mk63 calipers and solid or vented discs options.

Here is another link,
Starting bid off 60,000yen.Buy it now 70,000 yen which is roughly $aud 870 in japan.Landed in oz, vic, melb.assuming its sea freight,will come to around $aud 1280. These calipers come with brake pads.
Use a website language translator.

http://page13.auctions.yahoo.co.jp/jp/auction/r81486422

pics from auction:

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Im gunna be trying out the MG Metro 4 pot calipers on the cherry. These are used as a brake upgrade on all the mini's so I think they should fit under a 13inch rim.

like these ebay ones.

http://www.ebay.co.uk/itm/MINI-METRO- ... ts_SM&hash=item27be0a8c8e

The MK63 is cast iron though
And pricey for what you get

Theres not many 4 pots that fit under 13's

It is possable to use the R32/33 skyline calipers under 13`s. I use them on my circuit car using 13" rims. A bit of work, but achievable. The standard caliper mount has to be cut off and remade tho.

Thats alot of disc for a 13"
30mm thick and chunky

I'd look at trying to squeeze some RX7's under there before I went anywhere near the Skyline ones

I used 28.2mm thick discs from wilwood, the ultra light series

Try the metro turbo ones wombat, I think they are the desired ones