Greetings! Been quite awhile since I've posted here, but I'm back!

My stock 86 Daytona 2.2 Turbo 1 has a casted thermostat housing. I can't remember if I installed it or thats how I got the car. But I know the other turbo dodges Ive had and have use a stamped steel thermostat housing. Well, the one bolt which the dipstick tube attaches to keeps loosening up, and I believe these bolts are too short. Where can I get the proper metric bolts? Stainless steel? what grade? Any advice would be great!
Thanks,
Lee