I need to replace the ignition tumbler in the 85 (only 1 key) and the 83 (sticking)
There are really cheap ones out there, like $20. Or the dealer ? and some in between.

Which way should I go and why?

Also the key for the 85 is cut on both sides, but has the ridge down the key that is not cut (and fits in the ignition). This will not open any other doors on the car. Lots of keys in the glove box, but none work on the ignition but the one.

this same style of key on the 83 works the door (but will not fit in the ignition)?

I need more than one key for my car. The local locksmith is no help.

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83 300SD Dark Silver Dark brown inside