I’m doing a b series motor but I had a d series engine I just wanted to know what bolt can I use from my single cam for my b series cause I don’t have any like motor mount bolt and Tran bolt and flywheel bolt and clutch bolt and etc what bolt will work or should I just get all new bolt

 

You can go to a parts website (like www.hondaautomotiveparts.com) and compare part numbers between bolts.

 

A great rule of thumb when doing a swap is to KEEP ALL PARTS coming out of the engine bay until the new swap is completely installed and running... THEN you can get rid of whatever is remaining. During the process, you will see first hand which items are required to stay with the car, and thus, work with the "B" series.
If you are planning on selling parts coming out of the engine bay to "Fund" the new swap... you are going to have a really hard time and you will find that you will have to re-purchase some items that you have sold off or "tossed in" with other parts you have sold.