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Just wanted to share a good source for rear lens caps. Maybe I'm the only one that cares, but it really bugs me that almost all of my 3rd party lenses come with rear lens caps that leave the lens contacts exposed. I would buy the original pentax ones, but they are really expensive.
So I finally found a source on ebay for decent rear lens caps that are very similar to the pentax design. I ordered 10 lens caps from this seller didn't have any problems.
Pentax K Mount Plastic Rear Lens Cap Set (ebay link)
I hope this doesn't sound like an advertisement. I don't like posting ebay links, but I was really happy to find these lens caps and I'm hoping it will help other here who may be looking for the same. I'm not affiliated with the seller in any way.