Sounds promising. Do you know what model and year Toyota pad I would be looking for?
early 80s to sometime in the 90s... Check Rockauto under calipers and look at the piccies.
Look like this:
: A-1 CARDONE 19826 Caliper
TOYOTA 4RUNNER 1986-1989
TOYOTA LAND CRUISER 1976-1990
TOYOTA PICKUP 1986-1988
Please refer to catalog for application details.
https://www.rockauto.com/en/moreinfo.php?pk=23394&cc=1277502&jsn=17
Inlet Port Size M10 x 1.0
Piston Material Steel
Color Gray
Package Contents Caliper, Hardware Kit
Bleeder Port Size M10 x 1.0
Brake Caliper Finish Unfinished
Brake Piston Count 4
Installation Hardware Included Yes
Pads Included No
Mounting Bolts Included No
Piston Size (OD) (mm) 43, 34
Piston Size (OD) (in) 1.69, 1.33
Alternate/OEM Part Number(s): 4773060021
Center to center on the mounting bolts is the ever popular 3.5".
So the pads are:
And the RX7 pads
You should note that the RX7 mod----which I invented like 16 years ago---work only if you retain the brake booster.... The piston sizes are significantly smaller than stock..36mm vs stock 38mm...none of the various guys copying the design for the adaptor brackets --which I foolishly published to allow guys to easily and cheaply do the brackets for under $10 ever mentioned the smaller size which "we"--the owner of the first car we did it on and I----eventually discarded...We had done dual-master system with a balance bar and we could not lock the fronts on loose gravel...
The Toyota pick up Sumitomos are better and closer to what we'd want, but they're cast iron and so not hip enough, even if they would work better as an UP-grade.
A MUCH better victim caliper would be Nissan 300ZX, with 4 x 40.4mm
Slightly easier to clear many wheels without that bump outboard that the RX7 have.