Where to buy neutral safety switch, '68 Dart?

I bought one from the local parts store but it was the 3 pin type. They insisted they had looked it up for a '68, and I guess they did, I just didn't realize at the time there were 2 styles in '68.
I would like to use the original type if possible instead of modifying a 3 pin one.
bremereric, is yours new or used?
I had the trans gone through because it had several leaks. I'm afraid the switch will leak also as the plastic part will turn inside the housing.
Dallas

I'm nearly positive that in 68 Mopar only used a single pin switch so I think the auto parts store was wrong. It wasn't until 69 they used the 3 prong switch. I find auto parts stores are wrong a lot on old iron like ours.

As far as the switch leaking, I have worked on numerous trans. leaks over the last 28 yrs. and never found even one switch leaking through the plastic. Not saying it can't happen but I don't think it's a very high possibility.