Quick question - Since all FJ45s, even later ones, are drum front brake, should I order a pre-76 (pre-7509) brake master, or is there something different about a USA-spec 1975 master from a non-USA spec 1978 (7712 production date) drum front master? For that matter, I am seeing that USA spec lists a 47201-60031 for a 7501-7509 application and a 47201-60010 for a 7007-7501 application. Anybody know what changed in Jan of 1975 production? Deep versus shallow booster? TIA and happy cruisin'!