WTB: Trans oil filler tube & dipstick for 60 olds

My 1960 Olds 88 is almost driveable and I just now noticed that I am missing the filler tube for the Hydra-matic transmission. I put a plug in the hole for now, but it would be nice to have a filler tube so I dont have to jack the car everytime I want to service the transmission!...lol...I dont have a clue where to even start to look for one of these except to post in the wanted forums......HELP!!!!:o

If you're not concerned with it staying pure stock Lokar makes good stuff - Lokar: Anchor-Tight® Locking Flexible Transmission Dipsticks

Thanks for the info. I found a stock one from a guy on the HAMB for a good price. Im up and driving now! (at least in my yard!...lol)