This is my PBR branded, Pacific Beach Cruiser. I've added a couple accessories and now want to upgrade the seat and the forks. I would like to put stretch forks to the front but am not sure which ones to purchase. Is the head tube a standard size? How long should the forks be? I've called and emailed two lowrider parts shops in Cali that I would potentially buy from and have never gotten any response back. Please help me figure out which to purchase. Thanks for your help!