As usual,
@captdistraction is on the money.
To mirror our BMW product spectrum and further support the Mustang community, we plan to offer quality Mustang wheel hardware (spacers, stud kits etc.) in the near future. However in the interim, customers are currently using ARP extended wheels studs and spacers from a reputable source like Optimum Performance.
Stud length requirements completely depend on the spacer thickness used. The GT350R comes equipped with extended studs, therefore no modification is necessary when running 20 - 25mm spacers. For GT and GT350 owners, ARP 3.5" extended studs are recommended to ensure proper engagement.
LINK
Here is a photo of Rick's GT350 to help paint the picture. I get the feeling he's going to start charging me per use soon
Fitment question for a '13 BOSS 302 Laguna Seca - factory suspension w/ Maximum Motorsports caster/camber plates added...
I thought there was an initial offering by APEX of a 19x9 S197 front fitment offered, but that may have just been a market feeler back at the original offering to the Mustang community? If I can't do 19x9 fronts, what about 19x10 front and 19x11 rear? It's mostly a street car with no more than 2 track events per year. As for tire size, what would you recommend?
We included a 19x9" wheel in our survey, however the demand was convincing at the time. It is possible that we add a 9" wheel to our 19" lineup, however I would need to verify demand from the community to warrant production. A vast majority of S197 and S550 enthusiasts looking for lightweight performance oriented wheels are interested in running 10" wheels up front, or in a square format.
For an S197 Boss 302 I would highly recommend our the EC-7 19x10" ET40 rotatable square fitment with 285/35-19 tires. This is a fantastic setup, and the photo's below of the Kenny Brown Performance Boss 302 may help paint the picture.
Alternatively, if you are prioritizing rear end grip for a higher HP build, you could run a staggered 19x10" ET40 / 19x11" ET52 fitment with 285/35-19 front, 305/35-19 rear tires respectively. With this fitment, you naturally loose the ability to rotate wheels and tires effectively.
- Ryan