DW sells a lamp less leading edge installation kit for $80 (each). Or, you could just modify what you have now for a PAR 36 bulb. I did this on my used RV6 kit that I bought. The original LE light brackets were set up for a rectangular light. I cut the bracket to allow an opening large enough to accommodate the PAR 36 round light. I made a patch out of .032 that fits the PAR 36 bulb, and riveted it to the original wing bracket. Then I made a bracket clamp to hold it in place - just like the one that they sell. It was an afternoon of fabricating, and it worked out just fine.
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