I took off the gas tank on my '63 Plymouth Valiant and need a fuel sending unit. I was able to get the outside ring holder off OK, and the mechanism that came out is pretty rusty. The local dealer says it's not available and no one in the US has one. Said it's Mopar part # 2421493. Any ideas on where I can get something like this? And is the end filter piece separate? Thanks for whatever help you can give me.