Always use the tire pressure listed on the door jamb (when using the OEM spec tires). NEVER use the tire pressure on the sidewall - that value has nothing to do with the car - it is only the tire's maximum. For your application, use 42F, 38R to closely match load carrying capacity of the OEM tires. Regarding the bolts, you likely will not need new ones, but to check, count the threads the OEM bolts grab with the OEM wheels. Your 19's should grab the same number of threads. Here is an excellent source for bolts:
http://www.otisincla.com/
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