The Hella kits in my photo above are a single unit providing high and low beam function when plugged into the stock 924/944 harness. (The dual light setups in many GM cars have the outer light only do low beam and the inner light do high beam, but the outer lights are capable of operating at higher output and can be used as both low- and high-beam).
The Hella kits routinely sell for $80-$120 per assembly. I am offering them at $65 per side (so $130 for a pair) + shipping. These are bonafide Hella H4 kits with replaceable H4 bulbs.
In addition, you would need the GM-style frame + backing assembly. These only come as a complete unit with a sealed beam headlamp. I have not found a source that will sell them without the sealed beam headlight. I can also provide these assemblies as brand new in box, black frame and rear bucket for $24.70 per side or $49.40 for the pair, plus shipping.