There are several companys that do this type of custom molding. The problem is you first have to purchase a tool ,then you have to buy so many parts to keep the price down. The last custom tool that we had built was around 1700.00 and we bought 100,000 parts,still have alot of them left. The cost for a custom clam for a swimbait will be high. Be careful ,you can easly waist a lot of money.