Classic & Vintage - Shimano toe-clips

So I have Shimano pedals like the ones pictured below, which take an unusual kind of toe clip.

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I like the pedals, since I would occasionally scrape a pedal with the typical toe clip pedals I had on the bike before this. I've also sawed and filed off the cleat ledge, since it was wearing a groove in my shoe and made the pedals harder to flip into.

Since one of my current toe clips is showing a few signs of wear, I'd like to have a replacement on hand. Once in a while, a pair shows up on e-bay, but people don't often know what size they have, and I definitely need at least large. A plastic toe clip that fits these pedals seems to be available now, and I have two concerns with it: Will it be durable, since it's plastic? Will it fit shoes with boxy toes? (Metal can be bent.)

Do any of you have experience with these, or even thoughts?

N.B.: I don't want to buy new pedals or switch to clipless.

I have a set of those pedals that were giving me problems. The clips pinched down hard on the top of my toes and were painful almost immediately, mine are the plastic ones. I dealt with it by cutting the clips just behind the junction on top and of course eliminating the strap and now they are very comfortable and are easy to get in and out of, no longer scrape the road when the pedal is inverted, yet still provide adequate retention.

I'd try to find some metal clips. I've had some of the plastic variety break and as you said, you can't bend them to fit if needed. The metal ones show up on ebay, too. I think the 105 level pedals came with plastic clips while the 600 and DA version came with metal clips, if that helps at all.